Syncing all messages between devices
My new iPad does not sync text messages received by my iPhone that come from numbers. Examples are texts to give you a verification code. What should I do?
iPad mini, iPadOS 18
To send or receive SMS/MMS messages (green bubbles) from your iPad you must explicitly enable Text Message Forwarding for your iPad on your iPhone...
On your iPhone:
Settings > Messages > Text Message Forwarding - set to ON - and explicitly enable your iPad from the list of devices.
Also ensure that Messages in iCloud is enabled on both your iPhone and iPad:
Settings > [Your Name / AppleID] > Messages - set to ON
