I've had my iPhone 11 Pro Max for 4 days now, and I just sat my phone down for wireless charging. It worked fine for the first few days without any problem. Now, like many others on this thread, I experienced the same thing. I tried it on several wireless charging pads, and nothing happened. I immediately assumed that it was my Otter Box Defender Pro Series case that was the problem, so I started chatting with Best Buy Customer Service to set up a return. I ended up holding off on the return because I wanted to try charging it without the case. To my surprise, it was not a case issue as it did not charge without a case either. As many others have mentioned, I updated my IOS to 13.1.2 last night, and I'm wondering if this was the problem.
I don't know if others have had any luck, but I simply restarted my iPhone, and wireless charging is working fine now. If it happens again, I'm going to return the phone. I paid $1300 for this device, so this type of thing should NOT be happening. The main reason I upgraded was because my Xs Max had produced distorted notification (text) tones from the day I turned it on. I never thought I'd say this, but if this continues to happen, I'll be giving the Samsung Note a try.