Here are some steps you can take to troubleshoot OneDrive not working on Android or iOS:

1. Check to make sure that your device is connected to the internet.
2. Check to make sure that the latest version of the OneDrive app is installed on your device.
3. Uninstall and then reinstall the OneDrive app.
4. Sign out of the OneDrive app and then sign back in.
5. Restart your device.
6. Contact Microsoft Support for further assistance.