Richard Archambault on "[Plugin: Jetpack by WordPress.com] Publicize works for regular post type, but doesn't for CPT"

Hi!

Have a look here:

https://github.com/Automattic/jetpack/issues/8

As mentioned in this comment, your CPT needs to be added with a priority of less than 10. This will be fixed in the next update to Jetpack, but meanwhile, changing your CPT's priority to less than 10 should make it work.

Try that and let me know!