I cant login with backwards compatible games

In this case it may be a problem with your network infrastructure and not so much with the configuration you have assigned to your LAN.

Enter the game, press the smallest buttons on the controller at the same time (Accessibility and Start), this will open the Xbox 360 interface, log out by pressing X.

That done, restart the game and go to the Xbox 360 interface, choose Download Profile and download your profile again.

Sorry I phrased it wrong I meant I can only login if I use my Phone as hotspot

Hello!

I'm a Independent Advisor. I will be glad to help you.

If you only have problems using a mobile hotspot, you should consider that some telephone companies restrict the use of mobile data for certain activities.

Once connected, run a statistics and speed test in your console network settings and share with me the data you get from that test.

Best regards.

If I do that I wont be able to download my profile, i tried some things i found on other questions, but nothing works. I even bought a new console but same problem