Can't use the custom skin from Skin creator on Realms

I have made a custom skin via. the Custom skin creator where you can put shirts, jackets, etc. on your character. But when i try to use it on any type of Realm i only get the Standart Steve skin.

I have looked everywhere for a fix, but most of them only mentioned the imported skins.

I tried reinstalling the game, making a new skin, deleting unused ones, but nothing worked.

I am using Animated clothing, but i wouldn't understand why they weren't usable in Realms due to the fact that you have to pay for them.

 

Picture 1 is in the main menu,

Picture 2 is in our private Realm we play on.

Picture 3 is how the dressing room itself while in a realm, in this state i can also not edit anything about steve, nothing changes visually, neither the clothes, eyes, mouth, etc.

 

I've been trying to find a fix and have been unable for several days now. Please fix this!