Why i cant sign in?

Check this for a possible solution:
https://www.microsoft.com/en-us/p/xbox-identity-provider/9wzdncrd1hkw?activetab=pivot%3aoverviewtab

My gamertag is CJ2003XX44 and I cant sign in. Can you please tell me why I cant sign in. Thanks!

Why cant i sign in using facebook

Hi Kevand333, I hope you're doing great out there. I am an Independent advisor and I am here to help you in regard to your concern.

Kindly try signing in using a different account and check if the same issue will occur, since this issue still occurs on a newly repaired console it can be an issue with the account but we will check.

Also, if signing in to a different account still won't work, please perform ane extended powercycle and reset your network hardware by following the steps below:

1. Unplug the power cable from the back of the router, modem, or gateway for 5 minutes. If you have a router and a modem, unplug the power cable from both devices.

2. Press and hold the Xbox button on your console for 10 seconds or until it turns off then wait for 2 minutes before turning it on again.

3. After 5 minutes, plug the modem or gateway in first, and wait for all the lights to return to their normal state.

4. If you are using a router, plug in the router and wait for all the lights to return to their normal state.

venturebeat.com/.../xbox-live-is-down-microsoft-is-investigating-why-users-cant-sign-in