laucher gives me an error and does not let me enter the server

Today I bought my premium account with a lot of effort and my laucher gives me that the versions are very old and I try to enter and if it lets me enter minecraft but when I try to enter a server it does not let me say "that authentication is disabled due to maintenance"
and I don't know what to do, it cost me a lot to get the money to finally play and enjoy the game and now I can't, I need URGENT help