I called GM Customer Care 1-800-462-8782.
I went to dealer and asked them to assess my wireless charging module as it has never worked for me, regardless of the phones used with or without cases, and both on and off of their approved list that was released January 2018.
(Even though the truck was sold in 2017, so retroactively becoming selective with approved devices? Like lol, what?)
They tested it and used EL-51755 Test Tool, a small tool that to my analysis is designed to sit a wireless receiver in just the right position completely flush with the charging mat in order to get a connection over the single coil, and which indicated the charging module was working properly.
I then asked two of the service men who had approved phones to place their phones in the charging mat. Neither worked, with or without cases.
I also walked them over to a 2018 same exact trim as mine, and had them replicate the process. The phones connected instantly, with or without cases and with plenty of variance in positioning.
While they understood the situation they had to deny replacing the module with a 2018, as per their official testing it was working as intended.
I informed them that while I understood they are following official process, there is clearly a valid issue at hand and would be contacting GM Customer Care.
I called GM CC and gave a detailed description as above.
Within 24 hours the agent assigned to my case returned my call, although I missed it.
Since they are closed weekends I returned the call today, and re-explained my situation. The agent was friendly, understanding, and said he would contact my local dealer.
Within 30 minutes a service man from my dealership called, said some GM department he wasn't familiar with was calling him telling him to approve "something with my phone".
I returned this call within 15 minutes. Unfortunately this conversation was a bit deferring in nature, the guy was a bit belligerent in asking if my phone was on the approved devices list, and made some other hostile comments, basically presenting a "not my problem" and "this is how it is" attitude.
He would be happy to replace it with a 2017 module, but when I specified 13521066 he got upset and stated to me that it was a 2018 part and as he told me before he couldn't order it.
I told him I would prefer to contact GM CC and clarify things.
I recontacted my agent at GM CC, updated him on the call with the dealer, and stated clearly that my intent is to have GMC provide for me, under warranty replacement, a 2018 module part # 13521066 and that I will install it myself as I am quite sure the servicemen would gripe about the harness plug being slightly different.
I simply want my vehicle to function as advertised, and it is also well within the bumper to bumper warranty (which covers electronics).
I will update as things progress.