Hello LIVIA-MARIA,
I'm Shalom and I'd happily help you with your question. In this forum, we are Microsoft consumers just like yourself.
I’m sorry to hear that you’re having trouble logging in to your university account on Teams. the error code 2603 indicates that there is a network connection issue between your device and the Microsoft server. This could be caused by factors such as incorrect date and time settings, outdated app or Android version, or a VPN or firewall blocking the connection. Here are some steps you can try to resolve the issue:
Check your date and time settings: Make sure that your device’s date and time settings are correct.
Update your app and Android version: Make sure that your Teams app and Android version are up to date. You can check for updates in the Google Play Store.
Check your VPN and firewall settings: If you’re using a VPN or firewall, make sure that it’s not blocking the connection to the Microsoft server. You can try disabling your VPN or firewall temporarily to see if that resolves the issue.
Regarding your issue with Outlook and OneDrive, it could be related to the same network connection issue. You can try the above steps to see if it resolves the issue.
I hope this helps.
Best Regards,
Shalom