Microsoft Teams Priority Notification for all - extended to April 1 2020

Priority Notifications in Teams was released last year, but there will be a limit on how many notifications you can send. This will be based upon your plan.
As a promotion, Microsoft gave us "Priority Notifications - for all" for a couple of months, ending Dec 31. 2019. But the promotion has now been extended to April 1. (Link)

After the promotion, it seems all E3, A3 and higher plans will include unlimited messages, where E1, A1 and F1 will be limited to 5 messages per user per month.

Office Business will also be able to use this feature. Essentials subscribers will have the same 5 messaged limit, and Premium will be unlimited.