IMessage isn't working on my MacBook anymore

I used to use it all the time and out of nowhere it won't work anymore. All the messages are appearing in green, even though they are iMessage users. I've looked in Account details and Contacts and everything seems to be fine.
Help!

It sounds like you have done a lot of troubleshooting already, but I'm not seeing that you signed out of Messages on the Mac and then signed back in. I would also suggest that you try signing out of iCloud and then back in again (since your Contacts seem to not be registering correctly either).
Worth a shot....
Cheers,
GB

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