Simon MWizard
It looks like a bug with german IBANs. It also does not work with the example:
https://www.europeanpaymentscouncil.eu/sites/default/files/kb/file/2018-05/EPC069-12%20v2.1%20Quick%20Response%20Code%20-%20Guidelines%20to%20Enable%20the%20Data%20Capture%20for%20the%20Initiation%20of%20a%20SCT.pdf
I changed only the IBAN to a bunq-IBAN, then it works:
BCD
001
1
SCT
BHBLDEHHXXX
Franz Mustermänn
NL83BUNQ2025105789
EUR12.3
GDDS
RF18539007547034
I also tested Girocodes I used in the past, same failure. In Android the IBAN is visible, in iOS you get this text: