EX540503 - Group Calendar Issues

This doesn't work on web. It doesn't work anywhere but in the outdated version of the outlook desktop app for Mac. Even then it's not reliable. I even figured out how to resubscribe to the public folder in the outdated app, but it does not update anywhere else. This is a job hinderance for me. I've said it in the dialog box the countless times I've had to revert the app to the old version. No one at Microsoft cares.

Dear Rob Newbery,

Good day!

Thank you for posting to Microsoft Community. We are glad to assist.

As per your mentioned description about "EX540503 - Group Calendar Issues". Kindly note that this incident EX540503 is affected outlook for desktop client either windows or Mac, estimated starting at April 12, 2023 6:27 PM. The user experience of this incident is: Some users may be unable to view or access group calendars and email messages in the Outlook desktop client.

User impact: Users may be unable to view or access Microsoft 365 group calendars and email messages in the Outlook desktop client.

More info: Some affected users may also notice that impact self-resolves after some time, although impact may also reoccur at a later time. These users may also be unable to perform one or more of the following actions in the Outlook desktop client:

• -Add or access the group mailbox
• Add or access the group calendar.
• Add, remove, or edit group members.
• Changes to mail items, such as marking as read, archiving, or moving email to other folders.

Current status: We've identified that a recent service update is incorrectly triggering an indexer to remove specific values within the Outlook desktop client for some users, resulting in impact. We've developed a fix to repair this issue and are validating it within our internal test environments to ensure all affected scenarios are accounted for before proceeding.

Tenant administrators can view current information and updates on SHD at the link here: Service health - Microsoft 365 admin center

As WORKAROUND kindly use Outlook on Web. Currently Service Incident (SI) team is working on it from our backend side, and they will update SI information on service healthy in timely manner. For affected customers to easily identify the information here, this thread will be closed. You may subscribe to this thread or refer to SHD for updated information. I will also post back here once the issue is resolved on SHD.

Thanks in advance for your understanding! Your patience and cooperation will be highly appreciated.

Best regards,

Inema | Microsoft Community Moderator