Thanks for your reply.
Let me give some additional information.
ArcGIS Portal is behind the load balancer with WebContextURL configured. ArcGIS Server federated through load balancer URL of ArcGIS Portal. Geodatabase too located behind the load balancer and registered with ArcGIS Server as data store.
We are not entitled to have any additional Geodatabase other than the one above.
1. Where to locate ArcGIS Pro? Behind load balancer or in front?
2. How to maintain the same Geodatabase connection for Publisher and Server? Such that Web Feature Layer will use data from registered data store.
Please see the following article about managing registered data stores in ArcGIS Pro: Manage registered data stores
Sorry, I'm not sure I know the answer to your question about the load balancer. Here's an article that might provide some assistance: Multiple-machine deployment with third party load balancer—ArcGIS Enterprise
If you don't get a response from others who are more familiar with this subject, you can always reach out to technical support for assistance.