Peer to peer VPNs not going up

Hello Support.

Some of the ZeroTier users are having problems to reach end to end through the zero tier VPN. The host client is not able to reach the server client and vice versa, this is occurring in most of users in the ZeroTier network environment.
Any ideas or anything that could be causing these problems?

Hello,
has anything changed recently? The best first step is to make sure everyone is using zerotier 1.8.4.