We'd like to help! Just to confirm, have you selected 'Notify subscribers' under advanced settings before publishing the video? Also, are your subs reporting that no notifications are reaching them or your videos aren't showing up in their subs feed? Let us know.
Thanks for confirming. Can you get in touch with our Creator Support team who can look into this further: https://goo.gl/BxLi8H ? Hope this gets resolved.