Seems like my RFID RC522 module is not working well together with a NRF2401+ Module. Interestingly sometimes it is worked and sometimes not – one of those problemes we´ve all wasted hours on.
After two hours of nerve wrecking rewiring bug searching and again checking the properly wired wiring i finally made it.
simply set the RST and SS Pin LOW by hand before starting the Radio.
Shame on me, newbie mistake – i could have known better.