TCAS not displaying aircraft on radar

[Likeusb]

Flying the A330 and there was a whole lot of traffic outside of Helsinki, I was told about traffic near me, but couldn't see it on TCAS.

My setup for the system is TCAS mode on, TCAS atc 1, and tcas alt on, traffic selector on all, tcas mode selector on TA/RA

Tried with BLW for traffic selector, tried TCAS mode TA, couldn't come up with any solution, would love some input on this as I'd like to know where the aircraft are

[N1K]

I just had the same thing, couldn't see any online traffic.
Guessing it doesn't work?