A couple of my users are having trouble with this sign in error code 53003. When they open the App it asks them to sign in and then states they do not have permission. They have been using the app for over a year without any issues and then this started a few weeks ago. No policies or changes have been applied to their Conditonal Access. They are able to close the sign in error message and use the App without problem but its annoying to have it pop up every time they open it. Any ideas? Is this some kind of Microsoft glitch? I have about 45 users and this issues is only with 5 or 6 of my users. Our system admins can get around it by granting them a "maker" license for Power Apps but these users dont need to be making apps.

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