Review on KAUPOONK USB C to HDMI Cable Adapter - Supports 4k@30Hz, Thunderbolt 3 Dual Display Compatible with Samsung Galaxy S8 S9 S10 S20 Note9 MacBook iMac Chromebook Media by John Patterson

I've seen several people complain to Samsung about this so I'm not sure if that's the only issue. BUT the description specifically mentions Samsung, so no apologies for that! After a use or two, this cable seems to work when it wants to - as if there's a flaw that needs physics to figure out. It doesn't seem to work anymore even without a glitch. Very frustrating.