Thanks for the suggestion @Kal_Lam I sure will add request for feature, thanks.
However the issue I faced was related to a change in the config file for Enketo express, I had to manually change the config file to allow the private Ip address as per the instructions in this link - https://enketo.github.io/enketo-express/tutorial-10-configure.html (under ip filtering).
This solved my issue, posting here, if maybe someone else faced the same issue. Thanks.
