iPhone sending texts to Apple Message, not phones
I've run into this problem before, and it's usually that the phone number has some how become dissociated with iCloud but the email has not.

If, in iOS, you go to Settings / FaceTime, you'll see a "You can be reached by Facetime at" and this will often show if your phone number is even associated or activated.

Likewise, go to Settings / Messages / Send &amp; Receive / > and see if appears there.

See https://support.apple.com/en-us/HT201349 for details about adding numbers.