A common issue I've seen here. When exporting a sequence from premiere the color shifts dramatically in the majority of playback programs. Quicktime, Vimeo, Youtube etc. VLC works fine but not everybody is using VLC. Makes for lots of wasted time on color grades.
Comments from Adobe below
This is an issue we (Adobe) are aware of. The best desciption of this issue is in this article and the related video:
https://www.todddominey.com/2021/01/24/why-are-videos-washed-out-on-the-mac-exploring-quicktime-gamm...
A feature for handling this issue - adjustable Viewer Gamma - has been added to Premiere Pro v24 and is explained in this documentation: https://community.adobe.com/t5/premiere-pro-ideas/quicktime-gamma-shift-prevent-color-shift-on-expor....
Fergus