You sure you do it right? You need to turn on just the shifter to connect it with your phone. I have two shifters and two remotes and no issues connecting to them or setting them up.Can your phone find yours after the initial setup?
I hate Archer stuff so fucking much, my phone can't find either device now so I can't make it suit my new cassette, yay.
$260 on a new remote was money well spent......