Client VPN Doesn't Work When the Deployment Setting Mode is "Passthrough"

[Salman_K]

When I try to connect throw the Cisco Secure Client app from my PC, i get the connection, but i can't ping the IPs. This is when the setting mode is Passthrough, 

But when I am changing the mode to "routed," the client is working fine and can ping the property IPs.

My Issue is: I have 3 sites connecting together by the mode "Passthrough", when i changing the mode the connectivity between sites is disconnecting.

[alemabrahao]

On passthrough mode the MX acts as a VPN concentrator without performing NAT or routing for the VPN traffic. It simply passes traffic through to the upstream device. This means the MX does not advertise routes to other sites, so your PC can connect but cannot reach internal subnets because the MX is not doing any routing for that traffic.

https://documentation.meraki.com/SASE_and_SD-WAN/MX/Design_and_Configure/Configuration_Guides/Networ...

[PhilipDAth]

Make sure your internal network has routes for the client VPN subnet pointing to the MX.  This is a hard requirement.