Video sound is muted when using autoplay

Video sound is muted when using autoplay

xin chào, tôi sử dụng chức năng tự động phát cho video được chèn vào khung nội tuyến như mã bên dưới.

<iframe src=" https://workdrive.zohoexternal.com/embed/[my_id]?>?toolbar=false&appearance=light&themecolor=green& autoplay=true " scrolling="no" frameborder="0" allowfullscreen=true width=" 100%" height="209px;"></iframe>

Tuy nhiên, âm thanh của video bị tắt, người xem phải bấm vào nút bật âm thanh mới có âm thanh.
Vui lòng hướng dẫn tôi cách tự động bật âm thanh khi tôi sử dụng chức năng tự động phát video. Cảm ơn

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