I Bielefeld issue was building on a pi 4 . Using drpi=3 script.
In twisteros you can launch just like Linux system from Lutris frontend is easiest.
I was trying to launch from retropie. Now successful using georges forum on here .
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first