I ordered a new Dell XPS 15 9570 that I just received today. I want also to use Apple Thunderbolt Display as external monitor, two in fact the second is chained on the first.
But it does not work. The displays stay black. To connect the display on the XPS, I use the Apple adapter (thunderbolt 3 to thunderbolt). I also try to connect only one display, disconnecting the second one from the first but it does not work too.
I already connect my Apple Thunderbolt Display on a HP Spectre X360 2017 model from a friend and it was working very well.
I will try to check and update if possible the concerned softwares (boot firmware, thunderbolt driver).
Thierry, from France.