SO I am sure many of you have tried the usual suggestions but theres one thing missing in every ones suggestion....Have no fear I am here!!!
This error code cam after that Mandatory Xbox had on everyone account. Requiring you to do this.
Go to my account.
On the bottom of the page Click under Microsoft Account Security Proofs.
There you will have to sign in again.
Then it will take you to:
1. Change the password
3. Add a number.
4.Trust a PC
5. Add Security proof question.
After doing this Press Save.
NOW GO TO THE XBOX CONSOLE.
On dashboard go to settings.
Then go to storage.
Then click profiles.
On profiles Click on the profile you want to fix.
Click. DELETE PROFILE ONLY. (do not fear this will not erase anything important)
NOW HERES THE LITTLE THING PEOPLE MISS
Go back and check if the profile is gone. If it is go back to hard drive and Press Y. Click on Clear System Cache. DO THIS 10 TIMES. VERY IMPORTANT.
After this turn off the console for 45 seconds. Turn back on and Download profile again.
THIS WILL ALLOW YOU TO SIGN IN AGAIN.....
If there is still a security risk you will receive a message asking to change password or add a number or verify email. Once you do that. Turn off and on the xbox console and that should do it.
GOOD LUCK!!! If you have any questions. I will be here. =)