Username change makes Minecraft Unplayable

After changing my username from Hydroluxxh to Hydroluxxh it made it so that I was unable to join my own server (which is hosted by aternos) saying it failed to verify account. In the launcher, it also says in my account that my name is still Hydroluxxh. Alongside this, in singleplayer my name didn't change and after shutting down closing and opening my launcher over and over nothing changed. I ended up deleting my aternos server and made another one. Even then nothing changed and I'm still failed to be verified and my launcher still thinks I'm named Hydroluxxh.