- Verify that your Microsoft Classroom account is connected to the correct active directory.
- Ensure that your computer/device is connected to the school network.
- Check that your active directory username and password are entered correctly.
- Confirm that the correct internet protocol (IP) address for the active directory is being used.
- Clear your web browser cache/history, and then restart your device.
- Verify that your anti-virus or firewall settings are not blocking the connection.
- Re-install the Microsoft Classroom app if necessary.