No devices found on Android app

Hi , wondering if there would be a simple reason why i have no devices visible on my android phone app ?
was working yesterday but now i get the message (No devices added) then (sever error).
Have tried clearing cache and data , also uninstalled ,restarted the phone then reinstalled the app with no change , dash board works fine on PC and ISO app also fine.
It also doesn’t work on either of my pixel phones, Samsung phone or tablet.