Why is my bluetooth speaker connected but sound only comes out of the computer speakers?

My bluetooth speaker (JBL Charge 2) is shown as "connected in the blu tooth section of the task bar. I have also gone to system preferences and the speakers are also shown to be connected and chosen as the main speakers. However, no sound comes out of the bluetooth speaker but rather the sounds still comes out of the computer. speakers. I have tried connecting, reconnecting, and restarting computer. The bluetooth speaker is also shown as connected in bluetooth preferences. What is wrong?