If you have completed the previous session and the new one is still locked, please fully close and relaunch the Kure application and try listening to the session again.
If that does not help, please log out and then log back into the Kure app.
A new session unlocks at 4 AM on the following day, after you have completely listened to the previous session. The Booster sessions are optional and do not need to be finished, but we highly recommend them.