Thanks for your answer. The problem, as mentioned was, that i could not connect xCode to apple. Now i figured out, that i had to: in Xcode / Signing & Capabilities. "uncheck" Automatically manage signing. !!!most important!!!! create an "Apple Distribution" Certificate. Download and install it. register a "App Store Connect Profile" (with the Certificate above). Download and install it. As from there, i could follow your answer for the rest.