I was having the same problem. I could actually get it to work… but maybe only once every 20 times I put it down dead center. The pad would even light up to show that it registered something chargable was on it, but the lights on the pod would not react.
I have an Anker 10W wireless charging pad and my S20+ was working perfectly fine with it, charging the second I put it down, so I was pretty sure that wasn’t it.
What I eventually realized is, the charging zone for the case (and probably pad) must be TINY as heck.
I trial and error’d the positioning until I figured out that putting the pod down dead center was NOT what worked. I actually needed to place if slightly off center, with the charging lights EXACTLY aligned with the “Anker” logo on my pad.
With that PRECISE alignment, I could get it to charge every time. Not even half an inch to either side of the “Anker” on the pad though, and I would get the same non-response as before.
To be honest it might just be easier and quicker to just plug it in (Or maybe get one of those non-anker brand charging pads that has multiple coils).