My messages stopped being received on my macbook pro all of a sudden. I was still getting them on my ipad and iphone but not on the mac. After lots of troubleshooting it ended up working again by turning off two-step notification off on my icloud account. Is there an issue that is know of why it works this way? Thanks!
MacBook Pro, OS X Yosemite (10.10.5)
If you use 2 step authentication you also need to use 'app specific passwords'.
Using app-specific passwords - Apple Support
It's unclear if you had this setup correctly so I'd assume you may have had something incorrect with that, it is easy to enter the wrong password.
No passwords are correct. Imessage is not talking to the MacBook Pro. The message application on the desktop is blank. You see no conversations and the application is grayed out.
Messages doesn't get all your history if you set it up again - it may be normal to have no messages, depending on when you recreated the account settings.
As for it being greyed out, I suspect the account is disabled or not setup. You will need to describe where it is greyed out if it is not in the main Messages window, is it greyed out in Finder or somewhere else? Ensure it is enabled in the preferences.
I'm also confused by your earlier post, you suggested it had started working on this Mac, but now it isn't - is that correct, did it work earlier?
For what it is worth reboot & try setting up the Messages account again.
Messages on MacBook not working anymore
