Board Thread:Support Requests - Getting Started/@comment-46107028-20200618125423

In my profile, the 'favourite wikis' tab shows only one wiki, even though I've edited (ie contributed) to two of them: this (which it recognises), and this one (which isn't recognised).

The following was what I got when I attempted to add: I'm not sure what I did incorrectly to get this error. 
 * Join more wikis to see them here!