Sangoma S500 VPN enabled not working when site to site VPN exists

I have a few S500 phones. When I configure the users phone to use the VPN profile it works fine when they are connected from a location that isn’t also configured with a site to site VPN back to the office (so works fine from home since no VPN tunnel exists back to the office). When the phone is moved to another office, which has a site to site VPN configure, it doesn’t work. Is this by design? Subnets don’t overlap or anything.

works fine now. Simply configuration mistake on my side.