No VATSIM / IVAO Traffic

Continuing from the other thread about TCAS, I found that indeed its the VATSIM / IVAO online traffic that is the only one not visible in the MFD TCAS modes. :(

How can this happen when the traffic from these clients is just like all other AI traffic ?

I see them same like the rest of my AI package inside FSX only diferrence being not seing them inside CARENADO TCAS.

I checked, FSUIPC all it has is a drop down to define the TCAS ID string (tail number, flight etc.)

It does not change anything.

Any ideas ?