Can log in on laptop, but getting invalid credentials on desktop

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Guest
Title Can log in on laptop, but getting invalid credentials on desktop

Launcher Type FTB Launcher

Modpack Infinity Evolved

Modpack version 1.7.10

Have you modified the pack? No

Link to log file

Details of the issue As it reads in the title. Any ideas?

Invalid credentials recieved for user: EMAILHERE: com.mojang.authlib.exceptions.InvalidCredentialsException: Invalid username format. Username must have between 4 and 16 and alphanumeric characters. Underscore is allowed.
 
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