A Lesson Request needs to be sent and accepted to successfully book a lesson.
A student sends a lesson request
A lesson request sent by a student can book lessons 12 hours later at the earliest.
A teacher sends a lesson request
If you and your teacher have agreed to an instant lesson, your teacher can use the Lesson Invitation feature to send students a lesson request to start a lesson within 15-30 minutes. After you accept the lesson request, you can start the lesson soon!
Note that your lesson is only booked when a lesson request is accepted.
You might want to know: Why hasn’t my lesson request been accepted?