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MollDa's avatar
MollDa
Copper Contributor
Feb 05, 2026

Issue when opening Planner via browser

Hello everyone,

we are currently experiencing an issue when opening Planner via browser: every time, the sign-in screen appears and we are asked to sign in with our Microsoft account. This happens even though we open it directly via https://planner.cloud.microsoft. 

After we sign in, close the browser, and open Planner again, we are prompted with the sign-in screen once more.

 

 

 

While checking the cookies, I've noticed that no authentication information was created when signing in via direct url.

 

 

 

 

Using https://m365.cloud.microsoft/apps/ and open Planner from the Apps section, it creates authentication information in Edge / in the cookies.

 

Has anyone else experienced something similar?

Is this a known / general problem?

2 Replies

  • Anqders's avatar
    Anqders
    Copper Contributor
    Feb 06, 2026

    Hi,

    We have the same problem.

    Here is the summary of the troubleshooting steps attempted so far:

     

    Firewall Whitelisting: All necessary URLs have been added to the firewall's allowlist.

     

    DNS Configuration: It has been confirmed that all domain names can be resolved via DNS, so the browser should be able to locate the servers.

     

    Decryption: SSL/TLS decryption (inspektion of encrypted traffic) has been disabled for all relevant URLs.

     

    Security Zones: *.cloud.microsoft and *.office.com have been added to "Trusted Sites" in the Windows settings.

     

    Cookie Settings: The browser has been configured to allow third-party cookies for Microsoft domains.

     

    Testing with Private Account/Network: The issue has been reproduced on a private computer with a private internet connection and a private Microsoft account.

  • Anqders's avatar
    Anqders
    Copper Contributor
    Feb 05, 2026

    Hi, yes we are having the same issue. (Denmark). Have been going on for at least a few weeks. I have the same issue on a private PC with my private Office subscription, so we can rule out tenent settings I think. 

    Here is the summary of the troubleshooting steps attempted so far:

    • Firewall Whitelisting: All necessary URLs have been added to the firewall's allowlist.
    • DNS Configuration: It has been confirmed that all domain names can be resolved via DNS, so the browser should be able to locate the servers.
    • Decryption: SSL/TLS decryption (inspektion of encrypted traffic) has been disabled for all relevant URLs.
    • Security Zones: *.cloud.microsoft and *.office.com have been added to "Trusted Sites" in the Windows settings.
    • Cookie Settings: The browser has been configured to allow third-party cookies for Microsoft domains.
    • Testing with Private Account/Network: The issue has been reproduced on a private computer with a private internet connection and a private Microsoft account.

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