To be sure.. you went to your skins tab on profile, clicked a unit, and then clicked equip yeah?
#Skins not working while equipped
pure wren
umbral quartz
They showed as equipped when I checked them. I tried unequipping them then reequipping them but have not had those units yet in game. The first ones I noticed were the holiday seedling and chloropixie along with the santa head chef. I thought maybe it's because it's not the holidays, but then realized that the hermit is still working. I will update when I'm at home and back in game. I'm thinking maybe it was just a bug and reequipping them may make them work again.
pure wren
Hmm you know, you may be right! I am traveling now but I don’t recall seeing the ones you listed for a long time. I’ll test when I’m home next week if it isn’t resolved by then.
marsh hazel
Hmm that sounds pretty weird. Usually all skins should always work when equipped. But also when a skin is bugged (which happened when some files were corrupted in the past) it should be broken for everyone and not just individual players. I just checked the examples you mentioned (seedling/chloropixie) which seem to work for me: https://i.imgur.com/EdjTn0m.png
Is that something you can reproduce in a sandbox game (e.g. start sandbox game and place the units and they have their skins missing)? Otherwise I am not really sure how to check for a fix since it should work
Otherwise I haven't seen any other reports about bugged skins (except for the boxbox mimic maybe) recently, so not sure why it wouldn't work
Maybe try to verify your steam game files just to make sure they are displayed correctly. Possibly the game is using the base skins as a fallback if some files got corrupted: https://help.steampowered.com/en/faqs/view/0C48-FCBD-DA71-93EB
If that doesn't help, try to start a sandbox with the bugged skins and upload the game log files here afterwards