My MacBook Air won't send messages to non-iphones?

Yes, my iCloud is on both Mac and iPhone messaging & they're the same one. My MacBook air used to let me message non-iphones, but a couple months ago it stopped letting me. It's become an issues, what do I do?

Are you on about sending SMS via the Messages app? If so then follow this guide - https://support.apple.com/...ht8a28bb9a

If it's already set up then I recommend disabling it and doing it over again.

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