States in the known issues section:
FIXED
Unable to link Xbox Live profile
Fixed in Patch 7989. Steam players are now able to link their Xbox Live accounts in-game.
errm not its not, it was working , then suddenly stopped some weeks ago, just says im offline when obv im not as i can still play online.
Have tried reinstalling the game, checked firewalls etc etc and nothing fixes it.
Seen lots of posts about this, yet heard nothing about a fix.