"The home wiki for this account has a different password"
See URL: global account GMM doesn't exist, but ru.wikivoyage user GMM is asked for pt.wiki's GMM password to continue to global account creation.
AFAIK this shouldn't happen, I don't know what's going on exactly: Platonides, could the creation of the new local account by database fiat have had weird interactions with the change you made to forbid new local accounts conflicting with local accounts elsewhere?
Version: unspecified
Severity: major
URL: https://meta.wikimedia.org/w/index.php?title=Steward_requests/SUL_requests&oldid=4580938#GMM
Attached: