Users of Teams getting CAA2000B

Question

Users of Teams getting CAA2000B

Anthon van der Neut 0

Several user of Teams within the organisation I support are getting message that they need to sign up. Their accounts used to work and have not changed. It is unlikely to be an internet access issue, as not everyone is working from the office. They can use Teams, but the annoying messages pop in/up.

I tried to follow [https://learn.microsoft.com/en-us/answers/questions/2136311/unable-to-log-in-to-teams-in-my-organization-(erro](https://learn.microsoft.com/en-us/answers/questions/2136311/unable-to-log-in-to-teams-in-my-organization-(erro) which looks related, but there is no Microsoft Teams under All services, so I cannot follow the steps.

Please fix this issue, or point to accurate information on how to solve this.

FWIW I don't get any indication that something is wrong when I go to the Azure or the Billing site for these users/licenses.

Regards

Anthon SCR-20250108-eda

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Answer 1

Anonymous

Hi @Anthon van der Neut

Does the same problem occur in the Teams web client?

If the issue occurs on both the Teams desktop and web client, the problem may be due to the subscription in the tenant being invalid, or the administrator disabling the application. Please try the following possible solutions:

Check the subscription status: Make sure your subscription is valid and has not expired. If the subscription has expired, you need to renew it.
Enable the application: In the Azure portal, log in with an administrator account and navigate to Azure Active Directory > Enterprise Applications > Microsoft Teams. Make sure the "Allow users to sign in" option is enabled. (Or turn it off and enable it again)
Configure licenses: In the Microsoft 365 admin center, make sure that the license permissions for Teams have been assigned to the user.

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Anthon van der Neut 0 Reputation points

2025-01-09T18:07:15.2366667+00:00
Thanks for your answer.

The problem does not occur with the web application, only with the desktop application (and for multiple users). Reinstalling the desktop application does NOT make the problem go away.

the subscription status is active. We have 42 "Microsoft Teams Essentials" licenses of which 41 are in use.

the link to the azure portal does not work (The application could not be found. If the application was recently created or restored, please wait up to 30 seconds and try again.) Running self diagnostics did not help. Vias the search I came to 6 the Enterprise Applicationspage, but Teams Essentials is not listed there. And AFAICT there is no way to add it.
Anthon van der Neut 0 Reputation points

2025-01-09T18:14:16.52+00:00

I found Microsoft Teams but when I try to add it to "Enterprise applications" I get: 'An instance of this application has already been configured for single sign-on with this instance of Microsoft Entra ID. Multi-tenant applications that support unique endpoint URLs per tenant can be added multiple times.'

It is however not in the list of applications:
Anonymous

2025-01-10T09:08:49.4566667+00:00

Hi @Anthon van der Neut

We will conduct further research and testing on your problem, and if there is a better solution, we will contact you as soon as possible. Thank you for your understanding and support.
Anthon van der Neut 0 Reputation points

2025-01-13T05:27:10.3866667+00:00

Dear @Anonymous

Is there any way elevate this issue? Anything I can do, like providing more information (what kind would help)?

Regards
Anonymous

2025-01-14T06:25:33.2733333+00:00

Hi @Anthon van der Neut

Could you please tell me whether you are using Teams on MAC? According to our investigation, users who are using Teams on MAC recently faced the problem of being unable to log in to Teams.
Anthon van der Neut 0 Reputation points

2025-01-14T07:40:28.81+00:00

Hi @Anonymous

No, all 35+ users are using the version on Microsoft Windows 11.

Is there any way elevate this issue?

What is https://outlook.office.com/search as mentioned by the additional problem information, and why is that necessary? I checked that that site can be reached. ( 1) most of those users are using the built-in firewall/anti-virus so I would be surprised if MS blocked their own sites and 2) not all users are in the same location, so this is NOT related to some firewall setting (which of course just happened in the office days before the problems started).
Anthon van der Neut 0 Reputation points

2025-01-14T07:50:42.42+00:00

I don't know if it is related, but when I tried to add my Microsoft account to this account here on learn.microsoft.com, for the email address which is used for managing the domain that has Teams problems, I can login with MFA, but that account is not added. Something seems seriously wrong in your database.
Anonymous

2025-01-15T09:27:08.2733333+00:00

Please contact your administrator to run the diagnostic tool in the M365 admin center to check for the issue.

Sign in to the Microsoft 365 admin center as an administrator.

Select the Help & Support floating button in the bottom right corner of the screen to open the Help pane.

In the text box, type a brief description of the issue you need help to resolve.

Follow the prompts, and then select Run tests.
Anthon van der Neut 0 Reputation points

2025-01-15T20:38:27.78+00:00

I never to to the point were [Run Tests] was offered as an option. Gots some completely inapplicable answers from the AI self help.
Anonymous

2025-01-15T22:49:34.36+00:00

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Users of Teams getting CAA2000B

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