iPhone and iPad showing unread messages even though I’m not seeing any unread message

If your iPhone or iPad is showing an unread message badge but you're not seeing any unread messages in your inbox, it could be due to a few possibilities:

1. At times, you may have an unread message in a thread that you haven't read yet. Try opening every message thread and looking for any unread messages.
2. Check your junk folder for any unread messages. If you find any unread messages there, mark them as read. (See the pic below)
   1. 
3. If you're part of a group message, it's possible that someone in the group has sent a message that you haven't seen yet. Check the group message and look for any unread messages.
4. If you have multiple devices that are synced to the same account, it's possible that the unread message is on a device that you're not currently using. Try checking your other devices for any unread messages.
5. Try restarting your device see if it fixes the issue.

I am certain some of the above would have solved the issue stated by you.