After changed my name I logged show that it would show that and I'm trying to log on it but it says that it can't authenticate my connection. I found an article at appuals by Kevin Arrows https://appuals.com/authentication-failure-minecraft/ and it's really helpful

Hey dthbison,
This might help you.
When making an attempt to affix a Minecraft server, you'll encounter the did not demonstrate your affiliation error. because the error indicates, the users ar unable to attach to the servers and play the sport. This error sometimes happens once there's a flaw within the server or if the affiliation isn't stable.
Regards,
Mika Hawkins