Hi @Dandurand4,
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I noticed that you can only duplex the first tab in Excel, with your HP Officejet pro 8620 printer. I am happy to help!
To apply the duplex option to all worksheets in your workbook, follow these steps: When you print your workbook, all worksheets are printed with the duplex option.
1. Open your workbook.
2. Follow the following instructions based upon In Microsoft Excel 2003 and prior
On the File menu, point to Print, and then click Properties.
In Microsoft Office Excel 2007 and Excel 2010
Click the Microsoft Office Button/File, point to Print, click Print, and then click Properties.
3. On the Layout tab, select the one of the duplex options, and then click OK.
4. Click OK in the Print dialog box.
5. Repeat these steps for every sheet in the workbook.
Source: Only the first worksheet is printed duplex in Excel.
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Hope this resolves your issue, and thank you for posting! 🙂
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