For anyone else looking for an answer to this question like me, I bought this cable and it is bogus. Doesn’t meet thunderbolt 3 specs as advertised.
Edit: I found this thread after I bought it.
Everyone above that says power is probably correct!
I was having a similar issue and the best that I could come up with was buying a larger power supply to plug my dongle into.
Instead for like $5 more or so, I found a refurbished DeX docking station and it works flawlessly. I did also buy a USB-C extension cable so that I didn't have to keep my phone in the dock and I can use it normally.
DeX Dock: https://www.amazon.com/dp/B0788F8DKC?ref=ppx_pop_mob_ap_share
USB-C Cable
https://www.amazon.com/dp/B07QKJWW1H?ref=ppx_pop_mob_ap_share
Good luck!