Failed MacOS file sharing using wrong user account - how to reset?
Solution 1:
Network share credentials are stored in Keychain Access.app. Take a look there. You may search for ABCD to quickly find any credentials containing this login. You can then just delete the wrong items.
Please note, when using ⌘ K in Finder, your connection string needs to look like this:
smb://<ip address> e.g. smb://192.168.0.123
or
smb://<local hostname> e.g. smb://targetMacName.local (how to find/change local hostname)