Hi, I sent the following response to your email query also. I will give the response here as well (in case you don’t receive the email).
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It looks like the Main stripe plugin’s settings were never saved on this site (or the main stripe plugin doesn’t even exist). The subscription addon requires the main Accept Stripe Payments plugin to be active and configured first.
So let me check to make sure that has been done correctly.
Can you please show me a screenshot that shows that the “Accept Stripe Payments” plugin is active on your site? You can go to the plugins menu of your site to see all the plugins.
Next, go to the settings menu of that plugin and save the settings. Just hit save settings with the default values there (you can update them later). After that step, you can try to re-activate the subscriptions addon.