But that's just setting up email as an IMAP, which I could have done earlier. I need to sync calendars, which that doesn't solve.

App passwords don't work when the service takes you to the 2FA login, they're for less-secure apps that don't allow this. Yes I did try using the app password, but it failed and the prompt told me...

I'm using 2FA, and it won't sync. This is a problem on window's end.

They clearly want people to just use the web interface since they have their hooks into it.

Ran into the same issue. App Passwords doesn't work in this instance because Windows Calendar makes you sign-in online, where I can use the same two-factor sign-in as everywhere else. I'd assume...