Cant share share you tube video iframe api

both side video poster is shown. when the moderator play the video, the video doesn’t play in participant.

moderator:

SharedVideo.js:216 play state change {target: Z, data: -1}
SharedVideo.js:216 play state change {target: Z, data: 1}

participant:

SharedVideo.js:216: play state change {target: Z, data: -1}

seems participant not receive video play event