Fixed not being able to start a jitsi conference

I am accessing my jitsi domain via webbrowser and in the preview screen everything seems fine, but when I click "join conference" nothing happens. After a few seconds I get an error saying "your connection was terminated. A new attempt will be started in 30 seconds".

Fix
https://community.jitsi.org/t/jitsi-meet-in-docker-container-websocket-error/88703/15

roles/matrix-jitsi/templates/prosody/env.j2

@@ -5,7 +5,7 @@ ENABLE_AV_MODERATION={{1 if matrix_jitsi_enable_av_moderation else 0}}
 ENABLE_BREAKOUT_ROOMS={{1 if matrix_jitsi_enable_breakout_rooms else 0}}
 ENABLE_GUESTS={{ 1 if matrix_jitsi_enable_guests else 0 }}
 ENABLE_LOBBY={{ 1 if matrix_jitsi_enable_lobby else 0 }}
-ENABLE_XMPP_WEBSOCKET
+ENABLE_XMPP_WEBSOCKET=0
 GLOBAL_CONFIG
 GLOBAL_MODULES
 JIBRI_RECORDER_USER={{ matrix_jitsi_jibri_recorder_user }}