Accessing Microsoft Teams using organizational or personal credentials
Hi, and thanks for reaching out. My name is Miguel O., Sorry to hear you're experiencing this issue!
Error 53003 means that the Access has been blocked due to conditional access policies
Dillon Silzer posted a solution to a user who had a similar issue:
"This is a conditional access policy. You will have to consult with your IT Administrator to see which Conditional Access Policy is being applied to your account. It may be a location policy, but it is best to check with your team.
Have them check for sign-ins on your account and look up "Conditional access: Failure" "
Original post
https://learn.microsoft.com/en-us/answers/quest...
If your problem persists or the problem is fixed please let me know!