I answer this by myself:
the build no. must be higher than the production app version.
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Thank you for your help!
Currently I cannot change my subscriptions because they are in Review.
Do you mean I need to create complete new ones ? So completely new identifier and change the identifier also in the app?
Thank you for your answer.
Do you know if family share is possible together with Test flight?
Then he could access the app over test flight.