Hi,
I just made a test, Guru send email for the new lessons but not in the same day. When first user load Guru pages in one day, cron plugin from Guru check the emails that should send to students and for the rest of the day cron will be stopped. The next day, when first user load one Guru page (categories, courses, certificates...) the cron plugin send email with new lessons, payment expiration time...
When you create a new lesson, you should wait for the next day.
Kind Regards,
Alin