Logins do not require authentication under certain circumstances (i think)

When logging in with a microsoft account, and you recieve an error (may require having logged in atleast once with that account), you do not require authentication and you can just close the authentication window.

 

edit: forgot reproduction steps

Reproduction:

1.  Log out of the minecraft launcher
2.  Begin to log in.
3.  Upon recieving error 0x87DD0005, close the authentication prompt.
4.  You are logged in.