IMessage won't allow me to message anyone

When I try to use iMessage on my MacBook, I cannot message anyone. I get the error message that "(phone number) is not registered with iMessage." I can iMessage the same person using my phone, but for some reason it will not work on my computer.
I have already tried the logout/re-login fix, and cleared my message folder. Phone and computer are signed into the same account & phone number. Any other fixes?

Messages app on MacBook will receive but not send

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