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You must first manually add your WordPress network's primary site () to Patchstack before you can add the others.
You can do so by creating an account here and then by adding this site here.
Once you have obtained the API credentials, the credentials for your site can be added here.
Select the sites on which you would like to activate the Patchstack plugin. These sites must be accessible from the public internet.
Note that these sites must be added to Patchstack as well, which you can do at app.patchstack.com. Keep in mind that this might affect your upcoming bill depending on your current subscription plan.
If you are an AppSumo user or have a limited amount of sites you can add, you must select the proper number of sites that can still be added to your account.
For more information on adding sites on multisite environments, go here