Seems your PC can not differ between them - 2 different devices with same descriptors - and I assume SAME serial number?
See also https://www.microchip.com/forums/m748212.aspx
Long time no update here. Few days ago I received teensy 4 and was appalled how much current it draws without any load. I searched for answer and found this thread.
My question is, is there a summary of todos without reading pages of answers?
I got my Teensy today, and after the first verification I just press upload and it loads automatically, even if the image says "Press Button on Teensy..."
@dbuergin thank you