Unable to convert a UEFN map back to FNC map even though it says it is reversable

Last year I converted one of my FNC islands into a UEFN island. I now want to change it back and even though the creator portal says I am able to revert it back to FNC it wont let me.

I get the screen which says “If you click continue, this project will go back to being a Fortnite Creative island. You will lose all the changes you’ve made since you imported it into UEFN. This action is not reversible.” but when I click continue nothung happens.