ZeroTier not Working

So, due to maybe some matchmaking issue on Halo, me and my friend use to have high latency on Halo MCC on Campaing.
I had found a fix for this, using ZeroTier VPN, the matchmaking used to get the Virtual Lan adress, which had a diferent and faster network route (which we can still use on Parsec, and gives around 60ms), however Halo stopped using it for some reason, and the latency is high again, almost all the times we tried to play this last week.

I wonder, is there any Fix for the matchmaking itself? it may be related to the NAT of my network(Closed due to ISP), which is why ZeroTier was a good fix.