"#Blocked" eror in Microsoft

The "#BLOCKED!" error below is in Excel, and (as you can see) it's saying I'm "Not signed in"; but I am. I have signed in both when starting Excel this morning AND when starting up the computer and having OneDrive start up. I changed the password for Microsoft last week, so had to sign-in with that new password. Why then am I getting this error and what can I do about it? I do see that I have the option of Signing Out and presumably signing in again, but signing out comes with all kinds of dire warnings