What is your suggestion?
A friend of mine recently bought Minecraft and directly after that he tried to authenticate via the FTB App.
The login to Microsoft is of course successful, but the App displays "auth97 response not successful" instead of giving a proper explanation of what went wrong.
This solution was that he needed to login via the official Minecraft Launcher first to set the "ingame" name.
The error should state that it's initially required to set the name first before trying to authenticate via the App.
Alternatives ideas
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Additional information
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