Integration of Events + plugin with e-Newsletter plugin

Hello,
I have integrated Events + plugin with e-Newsletter plugin but I can not send events as newsletter. Is there something I am missing?
For debugging, I have created a newsletter using e-Newsletter plugin and that works fine, it means my SMTP settings are correct.
When creating event, there is an option to send this event as newsletter but that doesn’t work when I save or modify event.
Any idea what I am missing?
Thank you