Greetings,
I think you've covered it:
Canon Knowledge Base - Support Code 6000 (MG Models with Single Front Tray)
Power cycle, check for jams or obstructions, and contact Canon.
No magic fixes here. If power cycling doesn't work, and you are certain there is no jam or obstruction there isn't much more you can do.
~Rick
Bay Area - CA
~R5 C (1.0.6.1) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, +RF 1.4x TC, +Canon Control Ring, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve ~Windows11 Pro ~ImageClass MF644Cdw/MF656Cdw ~Pixel 8
~CarePaks Are Worth It
