I too had issues with the Elgato on a MacBook. But it’s a piece of shit and a pain in the ass on the PC as well for me. Hate that thing with a passion.
We also bought several cheaper generic ones and they work/don’t work just as often as the Elgato.
That being said, we switch around our setup a lot, and we juggle multi-can streams.
¯\_(ಠ_ಠ)_/¯