Failed to verify Username!! Help!

Quote from FaZeDarkStar

I would suggest buying the game and setting server to premium. I for one, don't support cracked accounts and I'm not sure why aternos has the option

first off, it does it with both premium and cracked accounts. 2nd.. why are you acting all high and mighty about "do this dont do that"..if your so big on paying for things why dont you go rent a server? its only 6$ a month...

Sometimes it might happen that you just set the server to "premium" accidentally.

I don't know why, but every time I start the server it starts in Premium-Mode, even though it doesn't show me in the settings. So I put my settings on Premium and back on Cracked and then restart the server. It usually works afterwards.
(maybe do the same with the Whitelist settings, sometimes this seems buggy too)