I recently joined Revolut but now found out, that the backend systems does not handle german umlaute (ä,ö,ü) correctly.
Currently it does ä → a; ö → o; ü → u, the correct behaviour is ä → ae and so on.
It’s definitely a good Idea and I have the same problem but it’s not really necessary since all my bank transfers etc. still arrive even with a “ö” in my name.