Gnome connect button disabled using file server type nfs under ""Connect to server" in File Browser RHEL7

Issue

Install RHEL server 7.5
Install Gnome 3
Login to desktop
Open file browser (Files/Nautilus) - v3.22.3
Select "Other Locations"
Enter an NFS address in the "Connect to Server" text box (e.g. nfs://fileserver)

Expected:
Connect button is enabled, and user can select it or hit Enter.

Actual:
Connect button is greyed out.
With "Connect to server" text box in focus, hitting Enter does not work.


RHEL Server 7.5 with GUI.
AD connected via SSSD
** LibNFS is installed **