Submitting a mac build for Mac App store with UE4.25.4 - Problems with Codesigning&Sandboxing

Hi, im having problems with codesigning and sandboxing with UE 4.25.4 Apps!

Working on MacOS Big Sur.

We have published a game with UE 4.22 and submitted it successfully into Mac Appstore, that means we have experience with that part … (This was a quite complicating thing, removing stuff and codesigning several times etc. But it worked with 4.22!)

But this time after trying and testing, i had no luck … is there a new tutorial or has somebody experience with that? Many thanks in advance.