You can actually activate the app yourself at the kasikorn atm. Be aware you need the passport number of the passport you opened the account with. It changes with a new passport every 10 years.
German Passport, right? Everyone in the IT knows, that you don't use ambigious symbols in codes that have to be read and typed like wifi passwords. No 0O 1l 6b etc. But for the german government thats "Neuland"