I cannot use my mojang log in for the website, launcher, or lunar client launcher. If I try to log into the website, using my Mojang login, the "log in " button, is grey, and does nothing when clicked. 

When I log in under Microsoft, it tells me I have to buy the game again. 

I have been trying this on several things.
first: the Minecraft website, I cannot log in using Mojang; I'm forced to use Microsoft, and stated above, I have to buy the game again.
Secondly: I have tried a custom modpack that uses forge on the main launcher 1.8.9 Minecraft. if I try to join a server, it just lags out the game, and all I can do is close it.
Third: Vanilla 1.17.1; this forces me to use the demo version.
fourth: Lunar client. I have tried 1.17.1 and 1.16.5 on it, but both end with the same result. I have to log in before I can do multiplayer or survival, and when I do it lags the game for about 10 seconds, then says "Cannot contact authentication server". If I try the sign in with Microsoft option, it does LITEALLY NOTHING...