How does requesting a new scope affect existing brands?

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I have designed a shopify app that is used by many brands. I would like to add a new scope to my app, but I am concerned about what happens in between adding the scope to my `.toml` file, and the merchant accepting or denying the new scope. If the brand has not accepted or denied the new scopes (maybe they haven't logged in in a while), is my existing app switched off? Or can I just not access APIs that require the new scope? I have tried to look around the documentation and cannot find any specific references to this case.