Authentication failed with az login #34169

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1. Yanan Cai (yanancai)

   added

   bugThis issue requires a change to an existing behavior in the product in order to be resolved.This issue requires a change to an existing behavior in the product in order to be resolved.

   on Oct 5, 2026
2. microsoft-github-policy-service

   added

   Auto-AssignAuto assign by botAuto assign by bot

   Accountaz login/accountaz login/account

   Azure CLI TeamThe command of the issue is owned by Azure CLI teamThe command of the issue is owned by Azure CLI team

   questionThe issue doesn't require a change to the product in order to be resolved. Most issues start as thatThe issue doesn't require a change to the product in order to be resolved. Most issues start as that

   act-identity-squad

   on Oct 5, 2026
3. x-engineering-agent commented on Oct 5, 2026

   

   x-engineering-agentbot

   on Oct 5, 2026 – with X Engineering Agent

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   Yanan Cai (@yanancai), the command, AADSTS50012 error, and CLI/MSAL versions are already clear. Could you try az login --use-device-code with the same account and report whether it succeeds, or the error code if it fails?

   Azure CLI 2.87.0 uses separate interactive and device-code sign-in paths. This comparison will help narrow whether the failure is specific to interactive sign-in before proposing a CLI change.

   Please share only the outcome/error code, not the device code, tokens, or full debug logs. I will revisit the issue when you reply.

   Posted by x-engineering-agent (Fixer)
4. x-engineering-agent

   added

   X Engineering Agent Needs InfoAgent is waiting for the reporter to replyAgent is waiting for the reporter to reply

   on Oct 5, 2026
5. microsoft-github-policy-service commented on Oct 5, 2026

   

   microsoft-github-policy-servicebot

   on Oct 5, 2026 – with Microsoft GitHub Policy Service

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   🔔 Routing this issue to @Azure/act-identity-squad.
6. Yong Zhang (yonzhan)

   assigned

   Yeming Liu (isra-fel)

   on Oct 6, 2026
7. Yong Zhang (yonzhan)

   removed

   questionThe issue doesn't require a change to the product in order to be resolved. Most issues start as thatThe issue doesn't require a change to the product in order to be resolved. Most issues start as that

   on Oct 6, 2026
8. Yong Zhang (yonzhan)

   added this to the Backlog milestone on Oct 6, 2026
9. yonzhan commented on Oct 6, 2026

   

   Yong Zhang (yonzhan)

   on Oct 6, 2026

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   az login
10. isra-fel commented on Oct 8, 2026

    

    Yeming Liu (isra-fel)

    on Oct 8, 2026

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    AADSTS50012 means something's wrong with the certificate. Please ensure you are using the correct certificate for authentication.
    https://learn.microsoft.com/en-us/entra/identity-platform/reference-error-codes

    
11. Yeming Liu (isra-fel)

    added

    needs-author-feedbackMore information is needed from author to address the issue.More information is needed from author to address the issue.

    on Oct 8, 2026
12. microsoft-github-policy-service commented on Oct 8, 2026

    

    microsoft-github-policy-servicebot

    on Oct 8, 2026 – with Microsoft GitHub Policy Service

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    🔔 Routing this issue to @Azure/act-identity-squad.
13. microsoft-github-policy-service

    added

    no-recent-activityThere has been no recent activity on this issue.There has been no recent activity on this issue.

    on Oct 15, 2026
14. microsoft-github-policy-service commented on Oct 15, 2026

    

    microsoft-github-policy-servicebot

    on Oct 15, 2026 – with Microsoft GitHub Policy Service

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    Hi, we're sending this friendly reminder because we haven't heard back from you in a while. We need more information about this issue to help address it. Please be sure to give us your input within the next 7 days. If we don't hear back from you within 14 days of this comment the issue will be automatically closed. Thank you!