I think the misunderstanding is you don't have to use apiKey for notarization, you can use an Apple ID app-specific password token to do this as well.
You can go to appleid.apple.com, create an app-specific passwords, then use that to notarize, and then you should be able to do this with your own account level permission, which I believe access to Developer Resource is enough, or app manager.
xcrun altool --notarize-app -u your_username@company.com -p your_app_specific_password whatever else options you want
apiKey is certainly a good option as well, but I still can't figure out how to generate apiKey for app-manager with different apps permission like you can in Users role and connect.
Topic:
App Store Distribution & Marketing
SubTopic:
App Store Connect API
Tags: