Suggestions: If 2 ephemeral node is resolving out of 4 mean dns is resolving ip address.
Did you run the dig command to check right name server?
Try below command. Example:
dig example.com +short +identify dig foo.example.com +all
Let's us know the issue.
I meant i have 4 name servers configured. But ephimeral node still doesn't populate.
Out of 4 two name servers are reachable from device and 2 are not reachable. Ideally it should populate the ephimeral node but issue here is it doesn't.