I am having the same issue with Outlook on my G6020; no matter what settings I have for the printer (duplex, letter, automatically choose paper source), it always wants to print from the rear tray. If I go into prefereinces from within Outlook, it has my settings set to rear tray. the cassette has paper in it, the paper size setting is correct, and I do not have this issue with other Office programs, such as Word. Very frustrating - it's bad enough the printer is much slower than my Epson color printer, but I just bought this and am considering returning it for this issue alone.
Interesting observation - If I quick print a pdf attachment in an email message, it prints from the cassette...hmmm
What version of Windows are you using? If you are using a Mac, what version of OSX is installed?
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I had the same problem and discovered it's not a printer problem. It's a problem with the application software, in my case MS Word 365 on Windows 10. The workaround (until MS decides to fix Word 365) is to open the printer driver (File-Print-Printer Properties), then Page Setup - Print Options - check the box that says "Disable the paper source setting of the application software".
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
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05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.