I can't imagine how this would work, but here we are:
Changed my router level DNS last night to something new, and everything seemed fine. This morning, FindFriendsMini reports login failures.
Double checked the password after manually logging in at iCloud.com successfully.
Still "login failed."
2FA is not enabled. And to be clear, I haven't changed the password for this account recently.
Any ideas? DNS seems a far reach, but it's the only thing that has changed recently.