[MC-70689] Can't change the skin

In all the versions change but in 1.8 no. I change to Aiden Pearce of Wacth Dogs But appear this

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Screenshots please

are you in a server that is running offline mode?

Your skin turn to Alex?
This is a hard question.
Requesting Mod To Explain This

First, we need to know if he is in offline mode, or the server, it that's true, this is invalid

Cannot Reproduce / Invalid