question about uefn and fortnite creative

hello, I have a small question.

my friend has a map in fortnite creative and yesterday he converted the map to uefn project and he sent me the.zip project and I opened the uefn project and added it to a team in the fortnite creator portal and everything is working and I can see the map and edit the map in uefn.

I just have one simple issue and that’s when I click launch session, I get a validation error. I tried clicking on validate project and still can’t launch the session. and I also did run the fix up and didn’t work. can I get some help please? thank you!