I am not receiving messages on my iPad ?
Can't seem to receive messages on my iPad or get into Facebook
iPad, iOS 10
Messages - If you get an error when trying to activate iMessage or FaceTime.
Some other things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.
Try a restart.
Restart your iPhone, iPad, or iPod touch
Try a forced restart.
If necessary
Do a backup and try a factory reset. Then restore from your backup.
Backup - Restore your device from an iCloud or iTunes backup.