It just worked for me too!  THANK YOU!!!  (I recently upgraded to Windows 11 Pro).

This is what fixed my inability to email invoices from QuickBooks24 Desktop:  A MILLION THANK YOUs to THE ORIGINAL WRITER!  As usual, Intuit was of no help whatsoever.  

For those of you who were as confused as I was, I found out the Microsoft XP Writer is installed in Windows 11, it just has to be checked to be "turned on".  Click on the Windows icon. (The 4 blue boxes that look like a window where your start button is located) At the top in the search feature type in Turn Windows features on or off.   A list will pop up. Cursor down the list until you find Microsoft XPS Document Writer under Microsoft Print to PDF.  Make sure it is checked and the box turns blue.  Once I did this and restarted my computer everything worked the way it did before I upgraded to Windows 11.