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Cannot access Exchange Online mailbox – Microsoft 365 tenant and account issue

Hello Microsoft Support Community, I need assistance with my Microsoft 365 and Exchange Online configuration. My situation: My email address is [Moderator note: Personally Identifiable Information removed]@nikel.sk. My domain nikel.sk is already…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-11-04T11:05:07.2066667+00:00
Adriána Mojžišová 0 Reputation points
commented 2026-11-05T14:47:21.5833333+00:00
BabybooHN 3,810 Reputation points Independent Advisor
3 answers

Email send limit exceeds for tenant need email alerts before reach the limit

Hi All i would like to receive email alerts before i reach my tenant send email limit to outbound external recipients but not being able to find out such feature in Exchange online admin center. Please let me know if i can receive these alerts through…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-10-06T13:25:00.2666667+00:00
adminofsense 0 Reputation points
commented 2026-11-04T17:58:13.54+00:00
Alina Le 5,805 Reputation points Independent Advisor
1 answer One of the answers was accepted by the question author.

Exchange Online PowerShell doesn’t expose New-DynamicDistributionGroup

I can’t access New-DynamicDistributionGroup in Exchange Online PowerShell. The term 'New-DynamicDistributionGroup' is not recognized as a name of a cmdlet, function, script file, or executable program. Check the spelling of the name, or if a path was…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-11-03T15:09:02.5633333+00:00
Sergii Machulin 125 Reputation points
accepted 2026-11-04T13:43:30.44+00:00
Sergii Machulin 125 Reputation points
1 answer

Rbac for application : getSchedule gets access to subject and locations of other calendar without having Calendars.Read to them ?

We would like to make an application that can : Check the busy status of people in an exchange tenant, without seeing the details of their meeting (no subject or location). Read and write into one (or multiple) shared calendar in order to invite said…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-11-02T09:33:55.9466667+00:00
Jean-Baptiste Zeller 5 Reputation points
commented 2026-11-04T12:41:31.2633333+00:00
Hin Vo 1,745 Reputation points Independent Advisor
1 answer One of the answers was accepted by the question author.

Migration Assistance

Hi All, Since the Microsoft FastTrack migration experience has moved to the Microsoft 365 admin center, I created a new migration project using the following portal: https://admin.cloud.microsoft/?Q=MACMigrations#/SetupGuidance/Migration My goal is to…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-08-05T12:21:52.03+00:00
Glenn Maxwell 14,371 Reputation points
accepted 2026-11-04T12:30:13.56+00:00
Glenn Maxwell 14,371 Reputation points
2 answers

All outgoing emails fail in Outlook for Windows

Hello, I need help with my company email account, [Moderator note: Personally Identifiable Information removed] @elite-connect.uk]. All outgoing emails fail in Outlook for Windows and Outlook on the web with this error: 550 5.1.8 Access denied, bad…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-11-02T09:35:36.5466667+00:00
Info | Elite Connect 0 Reputation points
commented 2026-11-03T14:23:16.23+00:00
Ana Le 2,960 Reputation points Independent Advisor
2 answers

Support for accessing Recoverable Items (Litigation Hold) in Exchange Online In-Place Archive mailboxes using Graph API

I could not find any official Microsoft Graph API documentation on how to discover Recoverable Items (Deletions, Purges, Versions, DiscoveryHolds) from an Exchange Online In-Place Archive mailbox for active users under Litigation Hold using Graph…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-11-03T07:04:11.4166667+00:00
gs singh 0 Reputation points
commented 2026-11-03T10:42:05.8733333+00:00
gs singh 0 Reputation points
2 answers

Error 550 5.1.8 Access denied

Our email was suspected of sending spam, with this rectified I need to unblock my emails so I can send emails. How can I do this? I have tried to submit a request to "delist" however it is saying that the email or IP address is incorrect …

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-11-01T20:48:26.31+00:00
SNT Admin 0 Reputation points
commented 2026-11-03T01:40:10.5866667+00:00
Austin-H 8,805 Reputation points Microsoft External Staff Moderator
3 answers One of the answers was accepted by the question author.

Microsoft 365 F1 has exchange k1

if i block owa users can still use pop feature what action would Microsoft take incase user in my org are using this

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-11-01T19:02:53.4633333+00:00
Asfand Allahyar 40 Reputation points
commented 2026-11-02T18:53:21.89+00:00
Ruby Nguyen 3,640 Reputation points Independent Advisor
2 answers

IMAP OAuth Regression: "User is authenticated but not connected" after successful token validation

I'm reporting a regression in IMAP OAuth authentication for consumer Outlook.com accounts that started recently. ISSUE SUMMARY: IMAP connections fail immediately after successful OAuth authentication. The server accepts the OAuth token but returns a BAD…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2025-12-19T22:13:09.1666667+00:00
Dean, Joseph (Cognizant) 30 Reputation points
answered 2026-11-02T14:42:34.4666667+00:00
Elias Chedid 0 Reputation points
1 answer

Exchange Online: move items from Online Archive back to primary mailbox (same folders) without leaving duplicates in the archive

Hi everyone, We have a requirement to move all items from a user’s Online Archive back to their primary mailbox in Exchange Online, keeping the same folder structure, and without leaving copies in the archive. The archive must stay enabled. Environment …

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-11-02T06:41:13.7033333+00:00
Vinay Shivakoti 0 Reputation points
answered 2026-11-02T07:11:05.5633333+00:00
Vasil Michev 128.6K Reputation points MVP Volunteer Moderator
2 answers

Sending a group e-mail and the gmail recipients are bouncing back to me

Sending a group e-mail and the gmail recipients are bouncing back to me

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-03-04T06:04:51.95+00:00
David Winterbottom 0 Reputation points
answered 2026-11-01T13:46:57.85+00:00
Akshay C U 0 Reputation points
2 answers

Exchange Online / Intune: Automatically Distributing Central IT Emergency Contacts to iPhones

Hello everyone, I am currently working on an internal IT project and looking for a suitable technical solution to centrally manage approximately 25 IT emergency contacts and automatically distribute them to the smartphones of the relevant employees. Our…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-10-16T08:44:55.5366667+00:00
Kugler, Joshua 0 Reputation points
edited an answer 2026-10-30T08:13:55.18+00:00
SecureContacts Team 0 Reputation points
25 answers

The operation couldn’t be completed. (com.apple.accounts error 3.)

unable to add exchange account to the mail app on osx

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2025-11-19T13:57:52.4133333+00:00
Ralf 85 Reputation points
commented 2026-10-29T23:32:42.6066667+00:00
Parashar Patel 0 Reputation points
0 answers

Microsoft Graph and EWS Parity - Roadmap clarifications and updated ETAs

Hi Microsoft team, I'm currently investigating the migration of an integration from Exchange Web Services (EWS) to Microsoft Graph and looking for clarification on the remaining parity gaps to help inform our technical design. According to the EWS…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-10-27T03:31:51.9366667+00:00
Tim Mifsud 0 Reputation points
edited the question 2026-10-29T09:56:48.61+00:00
Tim Mifsud 0 Reputation points
2 answers

Gmail is rejecting email from my domain

I have a private domain for my outlook email and gmail says i have a reputation problem most likely because there is no DKIM. How do I get DKIM for my custom domain? Moved from: Outlook | Web | Outlook.com | Account management, security, and privacy

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-10-24T05:25:44.98+00:00
Tim Ratermann 0 Reputation points
commented 2026-10-29T07:54:30.3533333+00:00
Hin Vo 1,745 Reputation points Independent Advisor
2 answers One of the answers was accepted by the question author.

Custom Domain verification is failing

Hello, I am trying to verify custom domain in Domain name services. I have added this two days back and the records are updated in my Domain Registrar. I have verified using the MXtoolbox and I am able to see the TXT record published but when I try to…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-10-23T19:39:09.4766667+00:00
Sameer Nagwekar 20 Reputation points
accepted 2026-10-29T04:19:18.8133333+00:00
Sameer Nagwekar 20 Reputation points
1 answer One of the answers was accepted by the question author.

Tenant Administration Recovery

An existing Microsoft organizational tenant is associated with our business domain. Microsoft's UserRealm endpoint identifies the namespace as Managed and returns the correct organization name. Exchange Online message headers identify a tenant GUID. The…

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2026-10-29T02:10:39.4933333+00:00
SherriA 20 Reputation points
accepted 2026-10-29T02:15:36.2066667+00:00
SherriA 20 Reputation points
1 answer

Can't resolve office365 high severity alert

Hello Please i need your help on this issue. One of my users received this email saying "High Severeity alert has been triggered".   Since on Thursday my user cannot send an email.   Here is the screenshot of the email.

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2024-03-30T22:13:51.2166667+00:00
IniobongNkanga-8038 1,011 Reputation points
commented 2026-10-28T20:36:35.72+00:00
Charles Chambers 20 Reputation points
1 answer One of the answers was accepted by the question author.

how to see users using ews in exchange

how can i see which accounts are actively using ews?

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

7,472 questions
asked 2025-03-17T16:10:07.0066667+00:00
Anonymous
answered 2026-10-28T18:41:35.8766667+00:00
Ashish Agarwal 0 Reputation points