I have a 2021 iPad Air and noticed that when I receive a message on my iPhone, it doesn't always go to my iPad. This happens with messages I get from people who are in my Contacts and with people who are not in my Contacts.
I use the same send and receive IDs for both accounts, and the iPad's Message filter is set to off.
What am I missing?
iPad Air, iPadOS 14
Ensure that both your iPad and iPhone are signed-in to iCloud with the same AppleID. To send or receive SMS/MMS messages 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
More information:
Fault finding if needed:
If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
Ensure that both your iPad and iPhone are signed-in to iCloud with the same AppleID. To send or receive SMS/MMS messages 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
More information:
Fault finding if needed:
If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
One possible explanation for the issue you describe would be if the missing messages were coming through the SMS/MMS system (as, for example, from an Android user) and your iPhone was not set to replay SMS/MMS messages to your iPad.
Check on your iPhone in Settings > Messages > Text Message Forwarding to make sure the entry for your iPad shows as enabled (green).
Messages not going to device
