Now about a week ago my phone and PC told me they could not connect to anything. As MS had seen suspicious activity on my account, and wanted me to change password. I did, and had no issues connecting my PC, phone or Xbox one again. Or even playing Xbox 360 games on the Xbox one.
Now today I wanted to use the old 360 again, as there are still games I have there that don't work on Xbone via backwards compatibility. But when I was told to enter my password, I got the 8015D003 error. I cleared the 360 system cache, done the security code thing again, and lastly did step 3 in the 8015D003 page, that was moving my profile to a usb drive, and re-downloading it.
Now when I enter my username and password, that works fine on all my other devices, and even this page. I get the "there's a problem with the credentials" issue. I don't have a 2 step verification or the identity verification app etc. So I'm lost on what
other steps I can try to get it to work. Any help or tips will be greatly appreciated. As there must be a step I've missed along the way. As others that had the same issue could not even play 360 games on Xbox one. But I can. It's isolated to the original