AdlibRegister

I'm trying to use AdlibRegister to do a WinWaitActive, and type some credentials for me.

I'm only doing it this way because I need to type the credentials into a popup that appears from a previous command that doesn't finish until the credentials are typed.

If GUICtrlRead($cAuto) = $GUI_CHECKED Then
        AdlibRegister("EnterCreds2", 5000)
        ExecuteCmd("Connect-MsolService")
        AdlibUnRegister("EnterCreds2")
    Else
        ExecuteCmd("Connect-MsolService")
    EndIf

Func EnterCreds2()
    If WinWaitActive("Enter Credentials", "", 4) <> 0 Then
        Send(GUICtrlRead($iUsername) & "{TAB}" & GUICtrlRead($iPassword) & "{ENTER}")
    EndIf
EndFunc   ;==>EnterCreds2

Is this the wrong way to do it? Or is it not possible?

I suppose another way to do it is by running a separate script that I pass the credentials to, but that doesn't appeal to me if there is an alternative.