1657 - Backup scan fails with error "OneDrive account could not be accessed"

Symptom

A OneDrive backup fails during the scanning task, with the following error presenting:

Cause

This error is seen when our system is unable to access a OneDrive account to scan its contents before backup. This can happen because the account contains files that were recently created or updated, or because it contains SharePoint shortcuts or shared folders that link to resources outside of this tenant. The error can also be seen when our system has not been granted the necessary permissions to perform backups.

Solution

Allow the next scheduled backup to run, as it is likely to be successful. 

If you are still seeing the error, take the steps below:

• In the Microsoft Entra admin center, confirm that the affected user's account is active and has a valid OneDrive/SharePoint licence. 
• Also in the admin center, confirm that the Redstor Cloud Backup application has the required Microsoft Graph permissions for OneDrive (Files.Read.All or equivalent).
• In the affected user's OneDrive, remove any SharePoint shortcuts that point to external tenants and/or any links to externally shared folders or libraries.

After making changes to the affected OneDrive account, manually initiate a new backup to check if the error still occurs. 

If the problem persists, log a support ticket.