UDP can be blocked. Doesn't affect browsing DNS is local anyway.
However it's arranged generally rovust VPN requires being able to send TCP over a well known port - which Wireguard by default doesn't do.
So I'm currently looking for an Android VPN app which can multiplex via a long live lived TLS connection.
This. Our courtesy corp network (for people’s personal devices) has a number of open ports on TCP. But almost none on UDP. Had to put an exception (favor really) with network security to open a port on UDP for my VPN