sorry my screen key is broken so i can't take proof please apologize.

So my concern is at the level of the skin with the official minecraft launcher so when I want to change my skin can import the version its puts me "impossible to register the skin" so I took an old skin that I had uninstalled before and it didn't work too its put me the same sentence "can't register skin" so i didn't understand why so i tried to duplicate my skin in the library and its put me "can't duplicate skin "so i'm trying with the base steve skin and not its also not working. So I don't understand so I go to minecraft.net and I change my skin manually and I can't save it in my library so it's pretty annoying when you have multiple role play ideas. I also try to uninstall minecraft and reinstall it and nothing has changed this problem thank you for helping me as soon as possible.