Locked out of my team's island builds

I am a member of a creator group. I can access the group projects from within UEFN. However, if I enter a build code in Fortnite for one of the builds from our creator group, I can’t get into the island. I get a message saying I can’t access this island because I need to be a member of the project. But I am a member. Help please. Thank you all in advance.