Greetings,
For now, you may want to avoid windows 11 in a full production environment. While most things will work, you may find that things you use or need frequently might not be fully supported yet.
On an aside, you can go back to W10 easily if less than 10 days has elapsed since the upgrade: Start menu > Settings > Windows Update > Advanced options > Recovery > Previous version of Windows (you may see "Go back" instead). Before doing this I'd ensure I had a back up of any important data to be safe.
On to your issue. Do you see where it says (Copy1) after the name of your device? This means you have multiple instances of the printer installed. Duplicate instances of an installed device is certain to cause communication issues and printing failures.
Next steps. decide what OS you are going to run. Either rollback to W10 or embrace 11 but be prepared for some nuances.
Considerations:
The MG3600/3620 is fully supported under W10
Canon has not released official W11 drivers yet. The W10 drivers might work, might work with limited compatibility and functionality or not at all.
If you rely on the system for productivity, I'd go back to W10. If you are ok working with a unsupported OS, you can move forward with W11. Once you decide which OS you want to run, we can try to assist with the printer.
~Rick
Bay Area - CA
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