@rawzace ,
Make sure the blow items are in place:
- VNET A and VNET B is Site to Site not VNET to VNET connection. When you create Site to Site connection, you will have Local Network Gateway deployed in each VNET and you will add address spaces. In VNET A's Local Network Gateway, you will need to add VNET B, C's address space and in the VNETB's LNG you need to Add VNET A's Address space.
- Make sure that the Gateway transit is enabled on VNET B and remote gateway is enabled on VNET C.
If these are in place, this scenario should work. If not let me know.
Regards,
Karthik Srinivas