error 4usqa in Teams prevents me from accessing the Desktop App

Question

Good morning. For a few weeks now, I've been unable to access the Teams desktop app with my account, which I use as a guest user in several organizations. The error I'm seeing is the following:

Correlation Id: dce8ca4c-3e55-452a-8f88-bf792ad71854

Timestamp: 2025-10-21T13:34:11.000Z

DPTI: 2c5d64b6dbc2adafd567d591d36f148d24cb326d17d8b4227475bb727f6481e0

Message: Access denied for the resource.

Tag: 4usqa

Code: 3399614475

I've tried repairing and resetting Teams, uninstalling and reinstalling it, and even deleting my Microsoft credentials from the Credential Manager. I've contacted the organizations where I'm a guest user and asked them to enable the Microsoft Information Protection API. It doesn't work.

I can access Teams from a browser, with some problems actually... I can only access through the following articulate procedure:

I need to access the sharepoint of one of my guest organizations via direct link, then click on my account (top right of the screen), then go to "personal groups", click on one of the groups, then on the Teams icon... and the Teams channels opens in the browser. But if I try to login in Teams direclty via browser, it just does not work. It remains stuck in the login page.

For the browser I have tried deleting all the cache, using Edge, everything... it does not work.

In any case, apart from the browser, I need to login from the app to join E2EE meetings, so this is a big problem for me. Can you help?

Answer 1

Hi Giulia, thanks for posting here in the Microsoft community, you’re getting an "Access Denied" error in the Teams desktop app because one of your guest organizations likely has a disabled Microsoft Information Protection API, which blocks login, what you can do.

 

First, Ask the admin of the guest organization to then Go to Microsoft Entra Admin Center then open Enterprise Applications then Filter for Hidden apps then Find Microsoft Information Protection API (App ID: 40775b29-2688-46b6-a3b5-b256bd04df9f) after that Set “Users can log in” to Yes then Save and exit.

Once done, restart Teams and try logging in again.

 

Also, you can try using the SharePoint-to-Teams browser trick you mentioned then Try logging in via another guest org (if available) and use the mobile app for meetings.

 

I hope this helps you out, let me know

Chard