Why can't I use video call feature of WhatsApp work on my Xiaomi Redmi 3S Prime?

my xiaomi 3s prime. in this phone I can't use video call feature. when I call to my friends he can not see me but I see hear why my whatsapp 

Hi Dee. Is your WhatsApp up to date? Also, check your front camera if it's working properly. If both are ok, I suggest that you go to Settings > Apps > WhatsApp > Clear data > Uninstall. Restart your phone then install it again.

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