Backend Service A depend on Backend Service B Error

I have a backend Service A as follows

I have a backend service B as follows

When I inject B to A , I get error as follows,

what did I miss?

@wss Your TauObjWIthCLientService is living in the scope of the global backend injection context. The VTestBackendService is living in the scope of the connection container module. While any service from a connection container module can access services defined in the global injection context, you cannot access services in connection container modules from the global context.

Effectively the connection container module is a child of the global context module. The global context cannot inject anything from its children, while children can still access their parents.