Exclamation Mark Badge in Messages
What does it mean when you have an exclamation mark badge on the message icon when you power on your iPhone then it disappears after a few seconds?
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That red exclamation point on the Messages app icon is telling you that there was a message(s) that it was unable to send and therefore the error. You stated that when you power on the iPhone then it shows up and then goes away after a few seconds.
Can you Try and Force ReStart Your iPhone as instructed in this article by Apple ➔ How to Force ReStart your iPhone.
That may clear the badge on the Messages app icon.
Axel F.