Unable to sign into IMessage on iPad
iPad wasn’t showing messages that were in iPhone. Turned off iMessage and when I tried to sign in the spinning thing never connected just keeps
on spinning.
iPhone 12, iOS 16
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If you are experiencing difficulties with activating iMessage or FaceTime, this support page may help with troubleshooting:
If you can’t turn on or sign in to iMessage or FaceTime - Apple Support
As for your initial problem concerning synchronising messages between your iPhone and iPad, assuming that both are signed-in to iCloud with the same AppleID, to send and 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