ok, sorry.
lost in translation! (i am german)
i misunderstood and thought i should now, when installing os-agent, specify the filename of the file i used for the HA installation.
but I have understood it now
sorry and thanks 
kann mir hierzu jemand noch eine auskunft geben?
It’s a bit difficult to tell to be honest. The reality is - that all the components that Home Assistant is currently complaining about being missing - causing the unsupported installation message - are in fact necessary, including NetworkManager. Additionally the underlying OS for the host MUST be Debian 11. Ubuntu or Debian 10 is no longer supported.
that not good 
so here is my host system:
should actually be debian 11!?