This DLookup has me stumped!

In a form [frm_MCOs], I have 2 fields, [ChangeAnalystApproval], [DocControlPassword]
In a table [tbl_Employees], I have 2 fields [EmployeeName], [Passcode]

I would like the database to compare the fields in [frm_MCOs] form to fields in [tbl_Employees] table like so:
[frm_MCOs]![ChangeAnalystApproval] must equal [tbl_Employees]![EmployeeName]
[frm_MCOs]![DocControlPassword] must equal [tbl_Employees]![Passcode]
If Password is blank, display msgbox1
If Passcode and DocControlPassword match, display the msgbox2
If Passcode doesn’t match DocControlPassword, display msgbox3

It recognizes the "blank" Password but the problem I'm having is that it doesn't seem to be comparing the Passcode and DocControlPassword.

Here is my code:

Private Sub DocControlCheckPassword_Click()
 
' msgbox1
If IsNull(Me.DocControlPassword.Value) Then
  MsgBox "You cannot enter a blank Password. Try again."
  Me.DocControlPassword.SetFocus
End If
 
' msgbox2
If DLookup("Passcode", "tbl_Employees", "EmployeeName='" & Me.DocControlPassword & "'") Then
  MsgBox "You have approved this change."
Else
' msgbox3 
  MsgBox "Password does not match. Please try again."
  Me.DocControlPassword.SetFocus
End If

End Sub