How to fix microsoft teams calendar issue?

Ahwazy Sapawi 0 Reputation points
2026-10-01T07:24:25.4966667+00:00

Unable to access microsoft teams calendar from desktop and mobile.

Microsoft Teams | Microsoft Teams for business | Teams on mobile devices
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  1. Hani-Ng 2,070 Reputation points Independent Advisor
    2026-10-01T08:18:22.4633333+00:00

    Hi Ahwazy Sapawi

    You can refer to AI's answer first for the detailed administrator-side troubleshooting steps.

    In addition, I suggest checking whether the issue also occurs in Teams on the web and whether the same account's calendar works normally in Outlook on the web.

    Since the issue occurs on both the desktop and mobile Teams apps, these tests can help narrow down whether the behavior is specific to Teams clients or is related to the account/mailbox integration.

    Please let us know the results of the following:

    • Can you access the calendar in Outlook on the web?
    • Can you access Calendar in Teams on the web?
    • In Teams, is the Calendar icon missing, or is it visible but unable to load? If an error message appears, please share the exact message or a screenshot with personal information hidden.

    Since the issue occurs on both desktop and mobile, these results can help determine whether the issue is limited to the Teams apps or may require your organization's IT administrator to check the account and Teams/Exchange configuration. The Teams Calendar depends on access to the user's Exchange mailbox.

    If the same issue also occurs in Teams on the web while Outlook on the web works normally, I recommend providing those results to your IT administrator so they can proceed with the administrator-side checks mentioned in AI's answer.

    I hope this information helpful and if your have any further questions, please feel free to ask via comment section.

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  2. AI answer

    2026-10-01T07:24:44.9033333+00:00

    Use this troubleshooting path for Teams calendar access issues on desktop and mobile:

    1. Verify the Calendar app is enabled for the affected account.
      • In the Microsoft Teams admin center, go to Users > Manage users > select the user > View policies.
      • Open the assigned App setup policy.
      • Confirm the Calendar app with ID ef56c0de-36fc-4ef8-b417-3d82ba9d073c is present.
      • If it is missing, restore it.
    2. Verify Teams upgrade mode allows Teams meetings.
      • In the Teams admin center, open Users > Manage users > select the user.
      • Check Coexistence mode.
      • It must not be set to Skype for Business only or Skype for Business with Teams collaboration.
      • If the user is set to Use Org-wide settings, check Org-wide settings > Teams Upgrade and confirm the default coexistence mode is also not one of those values.
    3. Verify Teams is not blocked from accessing EWS for the organization.
      • Run: 
             Get-OrganizationConfig | Select-Object Ews*
      • If EwsApplicationAccessPolicy is EnforceAllowList, make sure these entries are in EwsAllowList:
        • MicrosoftNinja/*
        • *Teams/*
        • SkypeSpaces/*
      • If they are missing, add them: 
             Set-OrganizationConfig -EwsApplicationAccessPolicy EnforceAllowList -EwsAllowList @{Add="MicrosoftNinja/*","*Teams/*","SkypeSpaces/*"}
      • If EwsEnabled is False, set it to True or Null.
    4. Verify Teams is not blocked from accessing EWS for the affected user mailbox.
      • Run: 
             Get-CASMailbox <UserPincipalName> | Select-Object Ews*
      • If EwsApplicationAccessPolicy is EnforceAllowList, make sure these entries are in EwsAllowList:
        • MicrosoftNinja/*
        • *Teams/*
        • SkypeSpaces/*
      • If they are missing, add them: 
             Set-CASMailbox <UserPincipalName> -EwsApplicationAccessPolicy EnforceAllowList -EwsAllowList @{Add="MicrosoftNinja/*","*Teams/*","SkypeSpaces/*"}
      • If EwsEnabled is False, set it to True.
    5. Run the Teams Calendar App connectivity test.
      • Open the Teams Calendar App connectivity test in the Microsoft Remote Connectivity Analyzer.
      • Sign in with the affected user account.
      • Enter the verification code, accept the terms, and select Perform Test.
      • Review the results for failures or warnings.
      • This test is not available for GCC and GCC High Microsoft 365 Government environments.
    6. If the issue is on a Teams Rooms device and the error is Cannot fetch calendar, enable modern authentication on the device.
      • On Teams Rooms, select More (...) > Settings.
      • Enter the device administrator credentials.
      • On the Account tab, turn on Modern Authentication.
      • Select Save and exit.
    7. If the environment uses Exchange Server 2019 or 2016 in hybrid mode and the Teams calendar fails randomly, install the required Exchange cumulative update.
      • For Exchange Server 2019, install Cumulative Update 9 or a later cumulative update.
      • For Exchange Server 2016, install Cumulative Update 20 or a later cumulative update.
      • This fixes an Autodiscover v2 site-awareness issue that can cause Teams calendar failures.
    8. If the checks above pass, collect the affected user principal name, the UTC time when the issue was reproduced, and Teams client debug logs, then submit a service request to Microsoft Support.
    AI-generated content may be incorrect. Read our transparency notes for more information.

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