Can't Delete an App

I'm running Sequoia 15.1.1 and cannot delete an app. It's NOT running. I've tried:

• Dragging it to the trash (bounces back to the Applications folder)
• Cmd-Delete (nothing happens)
• Terminal sudo uninstall file:// (Requests my password, but won't accept it even though it works to login to the laptop)
• Terminal sudo rm -rf (returns an extremely long list of files with "Operation not permitted" e.g., "rm: Freeform.app/Contents/PlugIns/FreeformSharingExtension.appex/Contents/Resources/pt_PT.lproj: Operation not permitted"
• Launchpad (no "X" appears on the app to delete it)

Any other ideas on how to get rid of this app?