Check HP Classroom Manager app permissions. If any of these permissions required to use your device's features are disenabled, HP Classroom Manager might not work.
Uninstall and reinstall HP Classroom Manager. If nothing else has worked, completely uninstall HP Classroom Manager then reinstall.
Restart your device. Last, restarting your device can often clear most problems causing HP Classroom Manager not working
2. Fix HP Classroom Manager Server issues & Internet Connection
Check network connection: An unstable Internet will make HP Classroom Manager be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
Disable VPN: VPN can cause connection errors and lead to HP Classroom Manager not working. Make sure all VPNs are off
Enable background data: When Background data is turned off, HP Classroom Manager may not be able to connect to the Internet when running in the background.
Reported Issues
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