Hybrid Network Endpoint Groups Backend Healthy is N/A or UNHEALTHY on Regional Load Balancer

[khhini]

Recently we try to do some PoC to create a Regional Load Balancer that forward traffict to on-prem banckend. After following all the steps in the documentations, we finally manage to complete the PoC. however in the proccess we struggle to setup the health check so load balancer can forward the traffict to an healthy banckend. We try to active the health checks logging so we can se wether the check is success or not, after that we try to reconfigure the health check and finally get the working health check configurations, but some how the log still resulting UNHEALTHY backend and in the gcp console also shown healthy status as N/A on every backend event tough the load balancer already working perfectly.

Is this a bug from google cloud or is there any reason why this happend?