cant view devices in my app

I get error 500 its when fire tv cubs are on

Turne them off i can see devices 

  When you say “reset”, do you mean shut it down -- wait a bit -- turn it back on?  Restore to factory and do the entire install thing again?

Or do you mean something else?

 I’m still having “No devices found” on the T-Mobile app.  A third party IP scanner app shows the expected devices and 5 unidentified devices.   

  However, when I shift to my other ISP, those mystery devices are no longer showing.

(Note that I am running two ISPs -- trying the T-Mobile for better speed and “forever” cost)

My decades of use ISP (Frontier) is an unmeasured service. The rates have been creeping up-- but a call to “retention” gets me back to my original rates for a year. I am riding a dual-link DSL, with a promise of fiber “soon” (been hearing that for a couple of years).  A call for tech support generally gets a human being in the US fairly quickly.

  The two times I somehow got past the T-Mobile ‘bot to get a human being, I got India (I think) and the Philippines. The Filipino lady was speaking english very well.

   Frankly, right now the lack of transparency by T-Mobile has me seriously contemplating ending the experiment.  And yea I’ve heard the stories of “lost” returned routers --- which means the “experiment” might cost me another $350ish upon quitting. ---- still contemplating.