OpenVPN - Sometimes works, sometimes not

[PotatoCarl]

Hi
I am using OpenVPN with OPNSense since many years. For some reasons we have multiple OpnVPN Servers running ("legacy mode"). The config is

WAN1: 1194 UDP
WAN2: 1195 UDP
WAN1: 443 TCP
WAN2: 443 TCP

The latter two servers are in the (from time to time happening case) that UDP connections are blocked by a firewall e.g. in a hotel.

Now, the fun part is: Depending on which server to connect, sometimes we cannot acces certain webservers in the company, and other times we can. Sometimes it happens on the UDP ports and sometimes on the 443. To be honest, I do not understand what the problem is - the firewall actually does not block it.

Maybe someone has an idea to debug this? Is it mandatory to move to the new "instances"  or can I continue to use the "old" setup?
Thanks