VBA IE 11 Runtime - excel

Question

I have coded VBA in IE 11 before, and have been able to work around problems, but on this I keep getting an Error 91 or Error 424. While sometimes it works perfectly.
Unfortunately I cannot share the exact site since its password protected, but I am including the source code that's relevant.
I do option explicit, so there should be no problem with my variables.
These are all the different ways I have tried to fill the box with yesterday's date, and none of them work.
html.getElementById("begin")(1).Value = Format(Date - 1, "mm/dd/yyyy") '<-error 91
Set StartDate = html.getElementById("begin") ‘<- Error 424 or Erorr 80010108
Set EndDate = html.getElementById("end")
Set CampaignID = html.getElementById("campaign_id")
These are the 4 different things I am trying, but they all work periodically.
StartDate.Item(0).Value = Format(Date - 1, "mm/dd/yyyy") ‘<-Error 91
StartDate.Value = Format(Date - 1, "mm/dd/yyyy")
StartDate.Value(0) = Format(Date - 1, "mm/dd/yyyy")
Set StartDate(0).Value = Format(Date - 1, "mm/dd/yyyy
Source Code:
<div class="row form-group">
<div class="col-xs-12">
<div class="row">
<div class="pull-left text-left" style="width:115px;margin-left:20px">
<label for="">From :</label>
</div>
div class="col-xs-3">
<input type="text" name="begin" value="" class="form-control input-sm datepicker" id="begin" />
</div>
<div class="col-xs-1 text-right">
<label for="">To :</label>
</div>
<div class="col-xs-3">
<input type="text" name="end" value="" class="form-control input-sm datepicker" id="end" />
</div>
</div>
</div>
</div>

Answer 1

I figured it out.
I was refreshing the page after I signed in. This reset the permissions and was blocking me from changing any of the text boxes. Not sure why, but it was half of the problem.
Then, I changed the variable editing to run through the whole list of "input"s on the page, as seen below:
Dim CampaignId, StartDate, EndDate, RunReport As Object
Set StartDate = appIE.Document.getelementbyid("begin")
Set EndDate = appIE.Document.getelementbyid("end")
Set CampaignId = appIE.Document.getelementbyid("campaign_id")
Set RunReport = appIE.Document.getElementsByName("_action_report")
ButtonNum = 0
Set objCollection = appIE.Document.getElementsByTagName("input")
While ButtonNum < objCollection.Length
If objCollection(ButtonNum).Name = "begin" Or _
objCollection(ButtonNum).Name = "end" Then
Set objElement = objCollection(ButtonNum)
objCollection(ButtonNum).Value = Format(Date - 1, "mm/dd/yyyy")
End If
ButtonNum = ButtonNum + 1
Wend
This way found the buttons on the page where the getElementById failed.
Thanks for looking!