Print job fails when selecting black ink Canon MP990

Print job fails when selecting black ink on a Canon MP990 using options of

Color Model: Grayscale (from default of RGB Color) and/or
Ink Type: Black (from default of CMYK color).

Using Version: 5.3.3-4 on Lubuntu 20.04 (LXQT)
uname -r : 5.4.0-58-generic

The issue occurs when connected as a USB direct URI or as a LDP configuration using a wifi connection.

/var/log/cups/error_log shows no errors.

Issue also arises when the above options are selected as print job options or as printer config options.
So is there another way to select black ink when colour is not required?

Thanks.