hello my message app is not working

Marking your own post as Solved may prevent others from trying to help because they think you have fixed your problem.

Device or computer?

IOS

See the Apple Support article(s) below.

If you can’t turn on or sign in to iMessage or FaceTime.  *

If you can't send or receive messages on your iPhone, iPad, or iPod touch    *

Some 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   *

Restart your iPad.   *

Try a forced restart. See the section towards the end of the article.

Reset Device. -

If necessary

Hard reset.     -

Do a backup and try a factory reset. Then restore from the backup.

Restore to Factory setting.      *

Restore - If you see an error when you update or restore your iPhone, iPad, or iPod.   *

Backup - Restore your device from an iCloud or iTunes backup.     *

OS

Messages – Can’t log in.   -

Messages – Can’t log in 2.  -

Messages - If you can‘t sign in to your iMessage account or FaceTime on your Mac.   *