Hello, I am Russian and so please excuse me in advance for my English. I have a few problems:
1. When you log in through your launcher to version 1.16.4 or more, I can't log in to the online game due to the fact that the button itself is black and not functioning, while if you hover over it, a sign with the inscription is displayed:check your account settings, but I can play the online game on versions 1.12.2 and below. Help please.
2. (I'm not sure if this question applies specifically to you) When you try to log in to a very popular license server, a sign with the inscription "Login error:null" is displayed"
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This report is a duplicate of MC-207896, which was later resolved as invalid. The reason for this is because, this issue is most likely caused by the use of illegal or incompatible software, which can cause several problems within the game, such as redirecting your login to a random server. In order to fix this issue, I'd recommend reading through the Mojang Notice attached to the parent ticket (MC-207896), and if the problem still persists after following the provided instructions, please contact Community Support as the bug tracker is unable to provide you with assistance.
try this video