That’s strange. I had a T480s (now replaced with a T14), and it always worked with whichever dock I tried. I have the Lenovo Thunderbolt 3 dock, which obviously works, I also have an HP Omen GA1 with an Nvidia 1080Ti inside, and a Dell dock at work, but I don’t have the exact model. Anyway, all 3 of them work fine on the T480s. Check the security settings to make sure the dock is getting granted access. Thunderbolt allows the connected device access to all of the computer’s RAM, so make sure you only use thunderbolt peripherials you trust. The Omen GA1 is also basically a real pcie slot for your laptop. I’ve used it with GPUs, 10 Gbps network cards, SAS controllers… always worked fine, just like a Pcie slot on a desktop.

I’m running exactly that, with zero issues. I also have a secondary profile with Google Services Framework on it for the 2 apps I use that absolutely require it. It works great. Seriously, I’m never going back to a stock Android phone after this.

That’s what they are! I have a box full of leftover parts from years of home repairs, and I frequently store caps of opposite genders screwed together like this.