Unable to Search Colleagues by Name or Partial Email in Teams/Outlook

Question

Unable to Search Colleagues by Name or Partial Email in Teams/Outlook

Yang Yueying 0

I’m a member of the IT department at my company, and all of our employees are using Microsoft 365 Business. Recently, we’ve encountered an issue where Teams can no longer search for colleagues by name or partial email address, which is causing inconvenience in our daily work.

In addition, when entering recipients in Outlook, some colleagues’ email addresses are not being suggested or auto-completed. For example, when I try to send an email to Susan, typing “susan” does not bring up her full email address.

Our administrator has not made any configuration changes recently, but these issues suddenly started to occur.

Could you please advise what might be causing this or how we can resolve it? Thank you very much.

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Answer 1

匿名

Hi Yang Yueying

Welcome to Microsoft Q&A forum

Thank you for the detailed description. To pinpoint the exact cause and give the best advice, may I clarify a few more information

1.How many users are affected right now? (Just a few people? One department? Everyone in the company?)

2.Does the problem happen on all devices and versions?

3.Teams desktop app / Teams web (teams.microsoft.com) / Teams mobile

4.Outlook desktop / Outlook web (outlook.office.com) / New Outlook

5.In Teams, if you type the full email address, does the person appear correctly?

The initial response may not fully address your needs, but it will help me better understand your situation and give the advice. Thank you for your patience while we work through it

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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Yang Yueying 0 信誉分

2025-12-05T08:48:26.42+00:00

Hi Allison,

Thank you for your reply. Here is the information you requested:

This issue affects all employees in our organization.

It occurs on all devices and systems, including macOS, Windows, and web.

It happens on Teams desktop app, Teams web.

It happens on Outlook web.

In Teams, when typing the full email address, some users appear correctly, while others do not, regardless of whether there has been prior conversation with them.

Please let me know if you need any additional information.

Best regards,

[Moderator remove personal information]
匿名

2025-12-05T14:59:05.88+00:00

Hi Yang Yueying

Thank you for the very clear answers

In the meantime, please check for hidden mailboxes

Have your admin run this in Exchange Online PowerShell:

Connect-ExchangeOnline Get-Mailbox -ResultSize Unlimited | Where {$_.HiddenFromAddressListsEnabled -eq $true} | Select DisplayName,PrimarySmtpAddress

If the CSV shows many/all users, run this command to un-hide everyone

Get-Mailbox -ResultSize Unlimited | Where-Object {$_.HiddenFromAddressListsEnabled -eq $true} | Set-Mailbox -HiddenFromAddressListsEnabled $false

If the file is empty or has only a handful of expected users and the issue still persisted, Microsoft’s support team will need to step in. A technical support engineer can perform a remote session to investigate the situation verify the backend configurations and run any necessary synchronization tools to resolve the problem. I strongly recommend creating a service request with Microsoft support to get advanced technical assistance and diagnostics.

-Go to Microsoft 365 admin center, log in with your admin account credentials

-Navigate to Support > Help & Support

-In the description box, enter the issue details

-Choose contact method > Submit the request

Report the Issue on Service Health:

Please have your IT Admin to check the Service Health dashboard in the Microsoft 365 Admin Center and report this issue. This will help Microsoft prioritize a resolution and keep you updated on any hotfixes or workarounds.

Apologies for redirecting you to the related development team support as the moderators in this community have limited resources to check the backend information, and to get the fast and better assistance we requested for it. Appreciate your patience and understanding
匿名

2025-12-06T14:12:33.75+00:00

Hi Yang Yueying

Just checking in to see how things are going with your issue. Were you able to reach Microsoft Support for assistance?

If you have any updates, feel free to let me know
匿名

2025-12-26T11:01:48.11+00:00

Hi Yang Yueying

If you have any updates, feel free to let me know