text messages

That could happen if those people had non-Apple devices (or Apple devices not signed into iMessage) and can only be reached by SMS/MMS messaging (which iPads cannot do unaided).

Check the following settings on the iPhone:

Settings > Messages > Text Message Forwarding

Does your iPad appear there?

Is the slider for your iPad green (enabled)?

Settings > [your name] > iCloud

Is the slider for Messages green (enabled)?

Check the following setting on the iPad:

Settings > [your name] > iCloud

Is the slider for Messages green (enabled)?

I struggled with this problem for weeks

I found if I deleted the iMessage (previous iMessages)

The next message I sent was a sms (green)

I struggled with this problem for weeks

I found if I deleted the iMessage (previous iMessages)

The next message I sent was a sms (green)