Azure Sign-in issue : error code - 50155

Question

Azure Sign-in issue : error code - 50155

Mohammed Altamash Mohammed Suleman Khan 2,431

Can someone please define where this policy is located? how can i exclude a user.

User trying to access

Application: Windows Sign In

Sign-in error code: 50155

Failure reason: Device authentication failed.

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1 answer

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Answer 1

Vasil Michev 127.8K MVP Volunteer Moderator

The most common reason for this error is issue with the device being disabled or deleted, not policy. Follow the instructions in this article to troubleshoot: https://learn.microsoft.com/en-us/entra/identity/devices/faq#i-disabled-or-deleted-my-device--but-the-local-state-on-the-device-says-it-s-registered--what-should-i-do

Goutam Pratti 6,220 Reputation points Microsoft External Staff Moderator

2025-03-17T11:25:03.34+00:00

Hello @Mohammed Altamash Mohammed Suleman Khan ,

I hope answer provide by Vasil Michev is helpful.

I understand that you are getting Sign-in error code: 50155 the reason you are getting this error because Microsoft Entra ID is unable to authenticate the device to issue a PRT.It is not based on the policy. Confirm that the device isn't deleted or disabled in the azure portal.

Resolution:

I want you to check the AzurePRT of the Device, so you can open command prompt and run as an administrator and check the command with dsregcmd/status

Confirm that your affected device Prt is Yes, or No? If it is No I want, you to leave and join again so that the error can be resolved.

Please follow the steps listed here to re-register the device based on the device join type: https://learn.microsoft.com/en-us/entra/identity/devices/troubleshoot-hybrid-join-windows-current#common-server-error-codes

Hope this helps.

If you are still facing the issue lets discuss further on this via offline.
Goutam Pratti 6,220 Reputation points Microsoft External Staff Moderator

2025-03-18T02:54:58.3633333+00:00

Hello @Mohammed Altamash Mohammed Suleman Khan ,

following up to see the above suggestion is helpful. Let us know if you have any queries.
Goutam Pratti 6,220 Reputation points Microsoft External Staff Moderator

2025-03-19T00:42:15.9633333+00:00

Hello @Mohammed Altamash Mohammed Suleman Khan ,

following up to see the above suggestion is helpful. Let us know if you have any queries.