KNX BAOS Modul 838 kBerry on OH4 on RPi5

Hi, I am trying to get the 838 module to work on a raspberry 5. It connects via serial port on pin 8 and 10 of this hat connector. If I understood correctly this is supposed to be port

/dev/ttyAMA0

However the log says:
Port /dev/ttyAMA0 not available

Do I have to enable that somehow?