If you are facing any issues with the OneDrive backup issue feature, please try the following steps to troubleshoot the issue.
These steps might solve your problem at hand
– Tap on the Gear icon on the main shelf of the app->Cloud & Backup->Cloud Logins->OneDrive->Sign out
– Go to the OneDrive website via the Safari app on your iPad or via your Mac/PC->login to your account->revoke access to the app under permissions
– Come back to the Noteshelf app and sign in to OneDrive again via Gear icon->Cloud & Backup->Cloud Logins ->OneDrive
Do try this out and if the issue still persists, please reach out to our support team via the in-app support portal.