I am using to wireguard to connect to my vps as well as 2 different vpns. So wireguard is not blocked in general. If any port is blocked I have not encountered that at the very leastmaybe they are blocking only a specific protocol or port? wireguard maybe?
Could you look around a little and check if you can establish TCP connections on the same port (or at all)? Also what about UDP on port 443?Wireguard to Oracle Mumbai - Doesn't work