No Cubase audio input in macbook

I trie to change my system from Win10 to mac osx12 with cubase 10.5. but I have no audio input signal. I tried steinberg uR 22 mk2 and motu m2. Both failed. I can hear audio samples and midi files but still have no audio input signal for audio tracks.
I asked Steinbergs hotline weeks ago. No answer. Who can help?