User blog comment:MisterWoodhouse/Resolving your overlapping username on Fandom and Gamepedia/@comment-45310000-20200421175126

So I had no Gamepedia or Twitch account. I created my Twitch account, got it verified, then I went and created an account on Gamepedia. I got to the box that asked to connect to the Twitch account, went over to that browser tab to make sure I had the right user name, and when I got back to the Gamepedia page, it had already set up my account without me doing a damn thing.

I gotta say, that was pretty slick.

Although it was slightly more manual process on Fandom to connect the Twitch account, but easy enough to follow.