Unable to Connect to Modem using App or Browser

I moved my Asus AC3100 router (which is in a mesh with an AC1900) to a new location. I made no other changes. I have always been able to connect to the modem via the iOS app, but now when i try to connect I get: Status: Unable to reach and No Connection.
My WiFi works fine. Just cant connect to the app. What am I missing here? I have restarted the modem a number of times with no success.

Thanks in advance. Hoping this is a stupid simple issue.