I'm probably way late on this, but if you have enabled 2 factor authentication, you need to set up a password specifically for Office on the Mac. To do this follow this article: -
windows.microsoft.com/.../app-passwords-two-step-verification
I'm probably way late on this, but if you have enabled 2 factor authentication, you need to set up a password specifically for Office on the Mac. To do this follow this article: -
windows.microsoft.com/.../app-passwords-two-step-verification