Azure Policy based VPN only supports one site, so multi site will not work. The new VPNGw1 would support more than 1 site, but it only supports IKEv2 and Meraki only supports IKEv1. so it will not work. If you want to use one location as main and route S2S to azure, Meraki does not support that. The only choice is to use vMX100, however, that does not support CSP model and I have not heard any roadmap on that.
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