I have the same problem. When I asked Postfinance, I was given the following answer: "There is actually a fault with the PostFinance TWINT app in combination with iOS 18 Beta at the moment. On Thursday, 8.8.2024, the PF TWINT update will be rolled out in stages over 7 days. With the update of the PostFinance TWINT app, this situation will be resolved and the app will function normally again."
SamS4
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution