A Microsoft file hosting and synchronization service.
I have a user with the same issue. They previously had Exchange Online Plan 1 license, but starting this past weekend, all their OneDrive files became read-only. I suspect this was because of Microsoft's crackdown on OneDrive usage without a proper license for OneDrive. Yesterday, I did assign a Business Basic license, which should license for OneDrive. At the very least, OneDrive now shows in the web as an option for his "My Apps". Yesterday, he still had the banner that said "You can't edit your files because your license to use OneDrive ended over a month ago. Ask your IT team to assign a license by (date) to avoid losing access." But today, that banner appears to be gone, but all of his files are still read-only/view only in both the OneDrive folder on his computer and in web. It has been almost a full day, so I assume that license changes should have propagated by now.
As for the questions given by Md Nahid Sultan:
- Have you tried logging out and signing back in? Yes, multiple times.
- Have you cleared your browser cache or tried using a different web browser? Yes, multiple times.
- Are you facing this issue on both the OneDrive desktop client and the web version? Both.
I can also confirm what Matthew Carter is experiencing with being unable to generate a link in the Microsoft 365 admin portal for this user's OneDrive. I also checked in sharepoint user profile settings for this user to make sure he is primary site collection admin and site collection admin to his own OneDrive, and he is.
I started a case with Microsoft yesterday, and will be working with them in the next couple days. I will update what I am able to find out.