One cannot expect users to enter information correctly. That should be done by an admin.
Picking apart your code a bit...
KiX is not case sensitive so I wonder why you force UCASE and then use a case sensitive ==?
Ucase($User.sAMAccountName) == Ucase(@USERID)
Rather that loop through all the users in a FOR loop, translate the name with the TranslateName() UDF, and then use the DN in a direct LDAP operation.
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