Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
Can you please elaborate your requirement?
- ExpressRoute and Site-to-Site Coexisting means having the ExR Gateway and the VPN Gateway in a single GatewaySubnet.
- See : ExpressRoute and Site-to-Site coexisting connections
- But with vWAN, you don't even have the option of "GatewaySubnet" and all the ExR and S2S Connections are managed by the platform.
Please provide more details and share the network diagram so we can assist better.
Cheers,
Kapil.