Can't steam audio via UDP port 6980

Hi guys,

I am using ZeroTier for gaming and need to stream audio from my local mic to the virtual machine. Both are on win 10. I am using VB Audio (Voicemeeter and VBAN). The two machines are connected and USB streaming via Virtualhere works like a charm. However, audio streaming via UDP does not work. Using Telnet it seems that port 6980 is not open. I have made sure the port is open via the firewall.

I now suspect that ZeroTier may mess with this. Does anyone have any idea how to fix this?