Messages failed to send
Why can’t I send pictures in a message on my iPad Air?
iPad Air 3 WiFi, Cellular
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You’ll need to ensure that MMS is explicitly enabled on your iPhone - and that Text Message Forwarding is also correctly configured on iPhone. Note, without an iPhone, SMS/MMS from iPad is not possible.
On your iPhone:
Settings > Messages > Text Message Forwarding - set to ON - and explicitly enable your iPad from the list of devices.
Settings > Messages > MMS Messaging - set to ON
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