I was having the same issue and noticed that my minimum deployment in xcode was 15.5, and I was trying to load simulators with an IOS version that was below the minimum. be sure to take a look.
zerosodium
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution