Calendar entries disappeared and found unrecognised group

Claire B 0 Reputation points
2026-11-13T00:05:28.3366667+00:00

I run my whole life against my iphone calendar and tonight the majority of the calender entries have disappeared. I have four calendars on my iphone as I have four mail accounts (icloud, x2 hotmail accounts and a professional email account) and I am not sure which calendar the entries have disappeared from. In my iphone calender app, a yellow triangle with an exclamation mark appears on and off against two of the calendars and says that they are unable to sync; however, without me doing anything this warning symbol will disappear but my missing calendar entries do not reappear. The missing calendar entries are not showing on icloud on my computer nor on desktop outlook for my hotmail or work-related accounts.

In trying to figure out what has happened, I found on desktop Outlook a 'group' named [Moderator note: Personally Identifiable Information removed]@groups.outlook.com - I cannot leave or delete this group and cannot find any invite to join this in any of my mail folders. I am assuming the issues are related.

Please please help me get my calendars reinstated!!!

Outlook | Outlook for mobile | Outlook for iOS | For business
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  1. BabybooHN 3,975 Reputation points Independent Advisor
    2026-11-13T00:51:42.3466667+00:00

    Dear @Claire B

    I would like to share an update regarding the connectivity issue affecting multiple Microsoft 365 services.

    According to Microsoft's notification (Incident ID: MO1550821), users may be unable to connect to or access multiple Microsoft 365 services, including Exchange Online, Microsoft Teams, SharePoint Online, Microsoft Copilot, and Microsoft Defender XDR.

    Microsoft has identified that the affected infrastructure is experiencing elevated load across multiple regions, which is likely contributing to the connectivity errors. Microsoft is currently restarting and repairing impacted portions of the infrastructure to restore capacity. Additionally, they are investigating an unexpected increase in a specific type of service traffic and evaluating options to redirect traffic to alternative infrastructure to expedite recovery.

    The incident is currently classified as Service Degradation, and Microsoft is actively investigating and working to mitigate the issue.

    If you have Microsoft 365 administrator privileges, please sign in to the Microsoft 365 Admin Center to view the details of this issue.

    If you don't know who the admin is in your organization, you can find guidance here: How can I find my Microsoft 365 admin? - Microsoft Support    

    Alternatively, follow these steps:

    • Sign in to the Microsoft 365 Admin Center.
    • Go to Health > Service Health.
    • Search for Issue ID: MO1550821.
    • Select the issue and expand the details to review the latest updates, affected services, impact, and remediation information.

    I'll continue to monitor this case and let you know if there is any update.

    Kind regards.

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