Waiting for the day that @YouTube @YTCreators @TeamYouTube stops marking my content as not advertiser friendly and actually sends out notifications 
The ad-friendly guidelines, best practices resource, and Creator Academy course should help provide more insight: https://goo.gl/A8ViTt . Also, make sure you've selected "Notify subscribers" under advanced settings. Your subs can check their settings too: https://goo.gl/T1T4kC