Once before a had this issue and we solve this, but obviously this does not work again. I'm sending to post author notification about expired post. We are notifying author 7 days before expiration. I'm doing this on add and edit post form, not sure if I need to add on both forms this notifications.
The post expiration feature of Toolset Forms plugin is based on WordPress CRON job, so if you add post expiration setting in both creating post form and editing post form, it will add two CRON job for each post, and your users will get two email notifications.
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