How do I add a scanner that is connected by a USB

This has nothing to do with Adobe.

To add a USB printer or scanner in Windows 11, connect the device to your computer, then go to Windows Settings > Bluetooth & devices > Printers & scanners. Click "Add a printer or scanner" and follow the on-screen prompts. If the printer isn't automatically detected, choose "The printer that I want isn't listed" and follow the prompts to manually add it. See link below for more details.

https://support.microsoft.com/windows/add-or-install-a-printer-in-windows-cc0724cf-793e-3542-d1ff-727e4978638b#id0ebf=windows_11

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.

<"moved from using the community">

That is a Microsoft problem, so you need a Microsoft solution
Go to the Search bar at the top of http://www.microsoft.com/en-us/ to find information on adding or removing a printer

what makes you think this is an adobe (as opposed to an os) issue.

and what adobe app do you think is responsible for.