@Ben Jennings Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well. I understand that you would like to establish connectivity between P2S Remote Clients and OnPrem servers via Azure VPN Gateway. This is possible as long as your S2S Connection is using a BGP.
- Your requirement is documented here : One VNet and a branch office (BGP)
- Only thing is that you have to manually add the routes to the Client configuration file.
- To advertise additional custom routes : Advertise custom routes for P2S VPN clients
Kindly let us know if this helps or you need further assistance on this issue. Thanks, Kapil
Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.