Ipad says Message failed to send/not delivered
iPad Pro 11 running iPadOS 18.1.1. Communicating with a group and one person has an Android device. I can send messages to the group with iPhone 15 but not my iPad.
iPad Pro, iPadOS 18
Unless your iPad Pro 11 has the cellular option you will have to turn on message forwarding so it can send messages via your iPhone.
About iMessage on iPad - Apple Support
Use iPhone to allow calls and text messages on your iPad - Apple Support