I use Microsoft One Drive to store my documents via the One Drive app on my Mac. Other MS apps (Powerpoint, Word) open normally but Excel files always default to Read Only which means I always have to save them as a copy. There are no Macros - at least none that I can see when I open a new blank workbook.
(using Sequoia 15.3.2)
MacBook Pro (M4)
Even though your other MS apps are working correctly....make sure to check that your License & Activation for Excel is active. Without Excel having an active license, it will default to read-only for opening documents. Usually if this issue occurs, there will be a banner line near the top of the document window....sometimes this is easy to overlook.
Since this is an issue with a Microsoft product, I suggest contacting Microsoft support.
Excel files always opening as Read Only
