Hi FazliddinUrunboev-8906!
Does anyone else have the same issue?
I tried to search the error code from the Microsoft Official document (Link: https://learn.microsoft.com/en-us/azure/active-directory/develop/reference-aadsts-error-codes)but didn’t find anything error code related to it.
In some blogs, it refers to this issue is related to Azure AD authentication. Maybe you can try to add a button to your configuration or content page to enable the user to sign in when needed. For more details, please refer to:
https://learn.microsoft.com/en-us/microsoftteams/platform/tabs/how-to/authentication/auth-tab-aad
Troubleshooting in Linux,Mint

It was working fine but I don't know what happened. I tried register to the meeting via browser link after that my app shows only this!
It works fine on the web and windows app. Only linux-mint app gives this error!
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AADSTS900023: Specified tenant identifier '8d46a076-d093-416d-a57b-8692cde13bf8>' is neither a valid DNS name, nor a valid external domain.
Troubleshooting details
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Request Id: 7cd66205-094a-414c-b325-1a94ede43700
Correlation Id: 2121b644-3583-4cb8-a47c-0f14fcd4ef88
Timestamp: 2020-04-13T03:06:50Z
Message: AADSTS900023: Specified tenant identifier '8d46a076-d093-416d-a57b-8692cde13bf8>' is neither a valid DNS name, nor a valid external domain.
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JimmyYang-MSFT 39,046 Reputation points Microsoft Vendor
2020-04-13T11:12:22.47+00:00 -
Grzegorz Puścizna 1 Reputation point
2020-10-11T09:59:41.037+00:00 I had the same error while trying to register to the meeting in Microsoft Teams.
In my case problem was pretty silly - someone gave me a wrong registration link (probably mistake in copy-paste).
Please check your registration link