The "This extension can view my subscriptions list." toggle, (in Manage Extension Permissions) doesn't do a check to see if the channel that the extension is installed upon, is eligible for Subscriptions at all.

Wording should/could be changed to prevent broadcasters of type BLANK (as apposed to affiliate/partner), becoming confused.

As they'll click the toggle, run the oAuth dialog and then the toggle is still off.

On hitting the toggle, change the popup response from:

"You have successfully authorized this extension to view your subscriber list!"

To

"You have successfully authorized this extension to view your subscriber list! But you don't have subscribers so when if you become an affiliate we are good to go"

And/or change the wording on the toggle to indicate that the channel is not enrolled in the subscribers platform