https://x3.xbimmers.com/forums/showt...1849221&page=4
See post 80. Unsure, if that answers any of your questions. Your situation is indeed odd.
Strange your OEM BMW charger (CTEK) does not work on your MHT, yet on your non MHT cars. I have an older OEM BMW charger (Deltran) hooked under the open hood to my MHT , no clicking sound, solid green light. Car is new.
Keep us updated, as I am interested in your resolution. I can't find the 48V replacement cost (i will ask parts dept) , some BMW 48v are say $1500.
As a suggestion, try the other forum series, as many others will likely have your same or similar questions. Soon success, I am sure.