Those who use Duo to video chat

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My friend in Chicago just got her S21 Ultra the other day it’s T-Mobile. I don’t use Duo enough but she uses it all the time and said there’s a feature and we tried it with each other it didn’t work. Knock knock feature where you can see who’s calling you before you actually answer the call.

Just curious if anybody else knows why it’s not working is it an Android 11 or UI glitch? I called her she called me didn’t work it told me my video was visible and when she called me I just saw a little notification bar at the top saying she was calling me. Thanks!

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