Does anyone have any ideas why this is greyed out? I can’t connect it to my board to make our workflows work.
Welcome to the Asana Community Forum @James_Pugh!
Is it still greyed out when you tick the box “Post to the channel about this tab” ?
Yep 
It was approved when we first connected
Hm strange then. I recommend removing (deauthorizing) it and then connecting again.
And in case that does not work I would contact support
Have exactly the same problem! And removing does not help anything. Have you found a solution yet?