I can only sign into messages on my mac book pro by using a guest account. The support community says post this finding if it happens to you. That is what I am doing. Any body any ideas on what to do next?
I have followed the instructions posted in the community about message / iMessage log in problems, and have worked through until the point where it says if this happens post your result.
I am posting...
MacBook Pro with Retina display, OS X El Capitan (10.11.3)