Video inputs with transparency, which codecs?

I'm looking to bring in some animated lower 3rd IDs. I had been making stuff on Mac and using the prores4444 codec which works just fine, but my workflow is changing and my graphics will be coming from davinci resolve on pc, so no prores codecs available. I've tried a good handful of containers and codecs thusfar from pc and none of them are giving me transparency in VMix.

Formats I've tried:

- quicktime/gopro cineform/rgb 16bit

- quicktime/uncompresse/ARGB 8bit

- quicktime/DNxHR/444-12bit

- AVI and QT/grass valley (this one gives me a semi opaque green, when I check premultiplied alpha in VMix I get chromakey green but there's artifacting in the video when I key it out)

All formats have been tried with straight and premultiplied alpha. The video I'm testing with is one of my stingers, the transparency works fine with a .tif image sequence of that same video.

"Video contains alpha channel" is checked and color correction/premultiplied alpha is checked for the ones it applies to as well.

I have some dark colors in a few graphics so I can't lima key it out.