Unable to change skin, reports a error with no information (same for website)

Basically, whenever i try to update my skin in Minecraft, it simply just throws a "Sorry! Something unexpected went wrong..." error to my face.

A friend also reported to have the same issue. I have Lunar Client, my friend doesn't.

Tried to reinstall the launcher, quit account and relog, uninstall Lunar Client, everything. Nothing seems to work.

What should happen:
Skin updates as normal.

What actually happens:
Throws a random error at me and refuses to update with custom skins. Low probability of updating with built-in skins.