Messages app has stopped working on my MacBook Pro

Hi MT2Leadership,

Welcome to the Apple Community, where some of us do our best to help each other.

Apple Support has an article online that may help you:

If you can't sign in to your iMessage account or FaceTime:

(Resetting NVRAM has worked for some.)

https://support.apple.com/en-au/HT202078

If you're on a network that's behind a firewall, you may need to enable certain ports.

https://support.apple.com/en-au/HT202078

If tips so far haven't helped:

If you changed your Apple ID or password lately:

Might be worth also checking out this article ...

What to do after you change your Apple ID or password

https://support.apple.com/en-us/HT204071

OR

Messages User Guide has a useful "Table of Contents" and search function:

https://support.apple.com/en-au/guide/messages/welcome/mac

For example:

Set-up messages on Mac

https://support.apple.com/en-au/guide/messages/ichte16154fb/mac

OR

There is a "Get Support" link to Apple at the top of this discussion, on the right.

Cheers :)