Board Thread:Support Requests - Getting Technical/@comment-92.220.57.64-20200513235151/@comment-24692230-20200514000645

Logging in with twitch on fandom doesn't automatically create you an account like it does on gamepedia, you need to register an account here, you can go to https://www.fandom.com/register and create an account by logging in with twitch, which should start the creation process (picking a username, etc), and then you can use the login with twitch button on fandom's login page like normal the next time you need to sign in to fandom.