Unable to send Messages on one of my iPads
I have 2 devices and I can’t text on this one
[Re-Titled by Moderator]
iPad, iPadOS 15
Your iPad is not a cellular telephone. It has no capability to send or receive SMS or MMS text messages, even if it has cellular data capability.
If you happen to own an iPhone, you may forward messages as follows:
Use iPhone to allow calls and text messages on your iPad and Mac - Apple Support