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 MAC Apps!

Working on MacOS Big Sur (No matter if M1 chip or Intel, we have tested both)

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.

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