i can't publish because of iOS

[BRGEzedeRocco]

Hello @CodeXLW ,
They mention the same issue in this post. You could follow the situation there to see if they share a fix or update.

Fortnite Ecosystem v37.50 with Known Issues

We are aware that UEFN developers may receive a failure to cook error for iOS when publishing islands. As a temporary solution, use the “Create Private Code” function in UEFN and then publish via the Creator Portal. We will let you know when we have more information or a fix.

Hope it helps!