Thread:Project:Support desk/Upgrade from MW 1.18.1 to 1.23.5 left duplicate users with Uppercase Uppercase rest lowercase USernames and now apparently standard Uppercase rest lowercase Usernames./reply (2)

Attempted to use Extension:UserMerge to merge: USername to Username.

Error: The old and new usernames need to be distinct.

Change Username to Username1 in database.

Merge USername to Username1 fails:

Error: Invalid old username.

Changing USername to USername1

Merge USername1 to Username fails:

Error: Invalid old username.

Only way to fix is delete all USernames from database and leave orphaned records!