SharePoint - Too Many Subsites

Issue:

We cannot proceed with the scan of the affected site collection due to a Microsoft Graph API bug that results in the thrown exception (“The request is unprocessable because it uses too many resources”) which appears in certain scenarios where the number of subsites in the site collection exceeds 12.

Fix:

To fix the issue, go to the invalid site collection and migrate those so there are no more than 12 subsites.