Using Outlook for Android for personal email and calendar management
I have this problem on my S24 and popped in here after doing a Google search to look for a solution. Now I get the Microsoft Community emails notifying me there is a new Reply to the question. If I click on the "Post a Reply", I must log in before I can see the new replies. My Community account is the same 365 email that I cannot validate in Samsung Email, but oddly enough, once I successfully log into MS Community, Samsung email is logged in and validated successfully. Weird, but I'm saving a copy of the Community email so I can use the "Post a Reply" link to log into 365! Try this if the problem 365 email is used in both places.
Obviously a temporary workaround, but I don't want to keep deleting my account from my phone, and re-adding it.