Hey there, Arne 👋
Payment from Deutsche Bank should be processed instantly since they participate in the Instant Payments. When you expect a payment to arrive from another bank, we'll immediately process it and add it to your balance as soon as we receive the payment from the sending bank.
I'd advise you to contact your other bank once again, and inform them about this issue, so they can further look into it. In case a payment is taking more than 2 business days to arrive, and the counter bank can't assist you, you can always open a payment investigation in the app 📲