Board Thread:Support Requests - Getting Technical/@comment-36541110-20200616054059/@comment-9605025-20200616150422

You cannot connect your Gamepedia and Fandom accounts at this time. The best you can do right now is connect your Fandom account to Twitch so that you can log-in using Twitch like you do for Gamepedia.

Fandom is working on merging the two user databases but have not yet said whether or not users who have accounts with different names will be able to merge the two accounts. In the case of two accounts with the same name, please see this blog.