Get ID for button in iframe and click it via VBA

I am trying to programmatically click a button of a popup iframe. Here is the code for the iframe:
<iframe width="100%" id="iMaintenancePopup" src="../oa/Common/maintenancePopup.aspx" frameborder="0" scrolling="no" style="height: 723px;"></iframe>

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Here is the screenshot for the popup iframe:OfficeAllyPopup.pngHow do I get the ID for the button that states: "I acknowledge this message" and how do I click it using VBA?
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Firstly, right-click on the button and select "Inspect Element" (the exact term may be different depending on the browser you're using).
Next, find the button id.
Finally, use some code like this:
Public Sub EE_Demo()

    Dim objIE As Object
    Dim objElement As Object

    ' Create InternetExplorer Object
    Set objIE = CreateObject("InternetExplorer.Application")

    ' Make sure the Internet Explorer window is visible
    objIE.Visible = True
    ' Navigate to your URL
    objIE.Navigate "your link"

    ' Wait while IE loading...
    Do While objIE.Busy
        Application.Wait DateAdd("s", 3, Now)

    ' Get the button
    Set objElement = objIE.document.getElementsById("buttonid")
    ' Click the button

    ' Clean up
    Set objIE = Nothing
    Set objElement = Nothing

End Sub

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thenelsonAuthor Commented:
In IE, I right-clicked on the button and selected "Inspect Element" but the button did not display in the DOM Explorer (or any of the other tabs).
Try in Chrome or Firefox.
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thenelsonAuthor Commented:
Ok, so I found that the button ID is "btnAcknowledge".

does not work, The automation does not see the button because it is in an iframe.
also does not work.

I am looking for the correct syntax for referencing the button in an iframe.
thenelsonAuthor Commented:
Or some other way to close the popup iframe if it pops up.
thenelsonAuthor Commented:
I found the correct code to click the button:
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