@BBigford said in Some MS Office Apps Unable to Sync to Office 365:

I've saw this before. Open up Credential Manager and delete anything related to Office. Don't just edit and verify, actually delete it. When you sign in again, it'll store a new copy. Happens sometimes with password changes or a bad sync between password changes.

Can find it in Control Panel or just search for it.

Hence why Apple products are working OK... They don't have Credential Manager. Same thing happens with Keychain on Apple PCs sometimes. But the mobile devices obviously don't have Keychain.

Apple products are NOT working okay, they are half working.