I believe Vz will have to fix this. It's likely because the firmware in the Vz router recently started redirecting from HTTP to HTTPS secure connections and is using a self-signed certificate. You can bypass this on a standard browser by clicking to accept (or in the "Advanced" section of a Chrome browser. However, I don't believe there is a way to do this in the app.
Is everybody on this thread using and iPhone? Apple has upgraded it's certificate trust policies on recent IOS releases. Self-signed certificates and some less secure certificates are now a problem. It is particularly a problem withe the IOS and OSX public betas
I am also getting this error. I've rebooted the router, renewed the lease on 2.4 and 5, uninstalled/reinstalled the app and no luck. Tech support had me on hold and transferred back and forth for THREE HOURS with no resolution
I went into my settings on my phone , went to “WiFi” if you have any unsecured WiFi in your setting such as “ optimum WiFi” press the little blue circle with the “i “ in the middle and where It says “auto login” make sure that’s turned off... then try to go back to the Fios app. It worked for me. With a iPhone FYI