Looking at the documentation of rut240 and rut950 with the old web GUI you need to put the preshared PSK key and add a secret ID selector for the IPSEC to work. This ID selector can be an IP address, an FQDN, or %any.
We don’t use remote and local identifiers in our IPSEC config and %any works fine but we would prefer to make it more specific just in case. It’s not clear in the documentation what IP I need to put in as a secret ID. Do I just put the VPN endpoint address? do I need to use the “My identifier” and “Remote identifier” option to make it work?