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If your Teams Phone client is not working properly, try these troubleshooting steps:
1. Check for updates.
Click on the 3 dots next to your profile picture in the upper right corner. Go to Settings. In the bottom left corner, click About Teams.
At the top, it will confirm if you are currently on the latest version or if you have an update available. If so, update your version of Teams.
2. Sign out and sign back in.
Click your profile picture in the upper right corner. Click Sign out. Teams will automatically open again; login with your credentials.
3. Clear the cache.
Visit the Microsoft Support site and follow the instructions to clear your Teams cache. Note: follow the instructions for "New Teams" as that is what campus is currently using.
Still need help? Open a ticket with IT Support Services for further assistance.