Hi RWAzureBackups,
Have you seen this tip about that error?
error-message-100010-when-trying-to-specify-items-for-azure-backup
An internal error prevented the modification of the backup policy. (ID: 100010)

RW Azure Backups
1
Reputation point
Simply put when try to select items (files/folders) to backup I get the error listed below.
An internal error prevented the modification of the backup policy. (ID: 100010)
I upgraded from Win10 to Win11, reinstalled Microsoft Azure Backup and no luck.
Any suggestions?
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David Broggy 4,266 Reputation points MVP
2022-08-28T13:33:38.433+00:00
IMO, The query needs a further deeper dive technically. I recommend you to create a technical support ticket. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.
Here is the link - https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.