I recently got a new 360 from a friend finally got to power it on when I went to go download my profile got this error. Wiped System Cache, Changed Password, Disabled 2FA, Turned off Recurring billing, Flushed DNS, Formated HDD, even changed Account emails. I've been fighting this issue for 4 hours, I want to play my Xbox 360 games because some of them don't work on Xbox Series X. I tried making a new account just for it to fold me the same error, this has dragged out way to long I should've been able to just log in without issues.
#8015000A
valid panther