Failed MacOS file sharing using wrong user account - how to reset?
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://&lt;ip address&gt; e.g. smb://192.168.0.123
or
smb://&lt;local hostname&gt; e.g. smb://targetMacName.local (how to find/change local hostname)