5 Tungsten

Re: Apple Thunderbolt Display port & XPS 15 Thunderbolt3

It should work, so I'm curious what happened with Thierry above where it worked on an HP system but not the Dell system.  Making sure your system firmware, Thunderbolt firmware, and Thunderbolt driver/software are all current is definitely an important point, and then I would be curious if the Thunderbolt Display triggered the device authorization popup that normally occurs when connecting new Thunderbolt devices.  Another option you can try at least for testing is changing your Thunderbolt security level to "No authorization", which is done in the BIOS.  In that case, you won't need to approve the device during the authorization popup.  I don't recommend using that configuration going forward, but again it might be interesting as a data point.