u/lazyadmin-nl

Microsoft is rolling out an update at the end of May that will enforce OneDrive storage quotas against actual license entitlements. If a user exceeds their licensed quota, whether because an admin set the limit too high or because of an EDU license overage, their OneDrive gets placed in read-only mode.

Read more on what you need to know and a short PowerShell script to find users that are currently over their actual OneDrive storage limit:

https://lazyadmin.nl/office-365/onedrive-storage-limits-enforced-in-june-what-you-need-to-check/