Thank you…yes, text messaging is turned on and the same Apple ID was used for all 3 devices. I get texts from all Android-user friends and can text message them on all 3 devices - except this friend! I can send to her and receive texts from her on my phone and my iPad mini 4, but they don’t show up on my new iPad 9 and I can’t text her from the same device.
However, I just looked and suddenly the text conversation we had yesterday & today via my phone & iPad mini4 ate now showing up on my new iPad 9. I just tried texting her again on iPad 9 but it still won’t send…and it took hours for the conversation from yesterday and this morning to appear.
I’m at a loss.