WAX 618 extender (extender) GUI Access

Good Evening:

I recently configured a WAX620 as my home access point. I purchased a WAX618 to serve as the extender for my network. I setup everything via the Insight app on my phone. It is working fine. Here is the issue; I can access the WAX620 GUI interface via its IP address from my computer, I cannot access the extenders via its IP address from my computer. I can ping it and I can see connections and connected clients using the insight app on my phone. What can't I access the extender via its IP address from my computer. Does anybody have any insight on this issue?

Much gratitude in advanced for any and all responses.

Respectfully;

Mark K.