Failed to log in: null

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. In order to fix this problem, please see the Mojang Notice attached to the parent ticket.

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We're tracking this issue in MC-207896, so this ticket is being resolved and linked as a duplicate.

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This may be because the minecraft launcher starts when it is not connected to the Internet. At this time, the launcher will not be verified. You can close the game and the launcher, and open the launcher and the game again to solve the problem.