Indeed it's very annoying. Trying to solve this same issue for a few days already. Apparently the only solution is fall back to the old approach reacting on keyboard related notifications etc.
olegklk
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Error: The address entered appears to be invalid. Please correct your address and resubmit.
Solution from here worked for me
https://stackoverflow.com/questions/68901435/cannot-enter-address-in-app-store-connect