Dear Avira,
“please provide one person called a navi in a serious context”
Why is it always about being called the title? Orthodox, apikores, navi, etc. It seems like you really need to reexamine the fundamentals.
A false prophet will be called a prophet by those whom he misleads. A true prophet has to be truthful. He doesn’t need to have a prophecy profile on LinkedIn.
But even from your limited perspective, there was the renowned Chozeh of Lublin. He wasn’t a one off example.