Why cant I launch session on my 1.0 Island that I converted to UEFN?

I converted one of my 1.0 Islands to UEFN because I wanted to revamp the map with the new UEFN tools but when I go to launch session I get this error message.

@ZyfaOn1 Hello! This is something that our Player Support team can investigate for you to give more information: Epic Games Technical Support & Customer Service | Epic Games