Messages from macOS Catalina

ltonyj43 Said:

"Messages from macOS Catalina: I am unable to send messages from my MacBook Pro running macOS Catalina, although they send quite happily from both my iPad 7 and iPhone SE. Suggestions, please?"

-------

New Messages Sync:

Try removing and then, adding back the phone from Messages.

Go Here: Add or remove your phone number in Messages or FaceTime - Apple Support

1. Remove: the phone number
2. Restart: the Mac
3. Add: the phone number
4. Restart: the Mac

You are welcome.