New Outlook calendar is not syncing with Teams calendar

Michael Harte 0 Reputation points
2026-09-17T06:44:23.94+00:00

We have a user in our company (approx 500 headcount) who recently began experiencing a really strange issue with her calendar in the New Outlook and Teams. New appointments, meetings etc... are not visible. Here's the kicker (two actually) the problem is also present in the cloud BUT it is working on classic Outlook.
We've tried cache clearing, sign-in/out, app reset and all that. We even tried logging the user into another freshly provisioned laptop but the issue remains. I am beginning to suspect this may be profile related somehow but I have just never seen this before. Any ideas or recommendation would be most welcome.

We've done repair/reset of Outlook was also done, even reinstalling Teams - issue persists

There is no issue in the Teams app on the iPhone.

FYI - we run a fully cloud based enviro, windows only, all managed from Intune/Entra... nothing hybrid

Microsoft Teams | Microsoft Teams for business | Calendar | Sync calendars

2 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Michael Harte 0 Reputation points
    2026-09-21T06:56:33.3066667+00:00

    Thank you @Dora-T for providing your suggestion. Our team spoke together about that and felt it too aggressive of a solution. I then decided to take a much closer look at the users new Outlook and discovered that they had activated some filter views of their calendar. By removing the filters, the problem was resolved.

    Was this answer helpful?

  2. Dora-T 1,130 Reputation points Independent Advisor
    2026-09-17T08:16:49.91+00:00

    Hi @Michael Harte

    Based on your description, I understand that the issue affects one user and persists across New Outlook and Teams, while Classic Outlook and Teams on iPhone work normally.

    In the meantime, you might consider creating a new Outlook on the web mailbox policy by duplicating the mailbox policy currently assigned to the affected user, and then assigning the new policy to that user. After that, please check whether the calendar issue is resolved.

    For more information, please see: View or configure Outlook on the web mailbox policy properties in Exchange Online | Microsoft Learn 

    Additionally, you can compare the mailbox policy assigned to the affected user with the policy assigned to a user who is not experiencing the issue. If you find any differences, you can adjust the corresponding settings in the new policy and test again.

    If the issue still persists after these checks, I recommend contacting Microsoft Support for further assistance. You can include the troubleshooting steps and results above to help them better understand the situation.

    If you have access to a Microsoft 365 Global Administrator account, you can create a support request by following these steps:

    -Sign in to the Microsoft 365 admin center using your Microsoft 365 Business administrator account.

    -Select the Help & support (headset) icon.

    -If Support Assistant is enabled, turn it off.

    -Type contact support in the search box.

    -Select Contact support, then choose Phone or Email to submit your request.

    For further instructions, you can follow this guide: Get support - Microsoft 365 admin | Microsoft Learn.   

    I hope this information helps!

    Was this answer helpful?

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.