This iframe code is created using the OneDrive embed tool. The only thing I changed is modifying the width and height to be larger than the viewable area of the spreadsheet. Up until last week, the embedded spreadsheet showed no horizontal or vertical scrollbars because the selected Excel cells are smaller than the specified iframe size. But now they appear every time.
<iframe width="850" height="1500" frameborder="0" scrolling="no" src="https://onedrive.live.com/embed?resid=DE39D4C90D08CEFA%21143&authkey=%21AOzMiyGUHG7HvJ4&em=2&AllowTyping=True&ActiveCell='My%20Portfolio'!S7&Item='My%20Portfolio'!A1%3AV39&wdHideGridlines=True&wdInConfigurator=True&wdInConfigurator=True&edesNext=false&resen=false"></iframe>