Microphone is not working....

Hi There,

I am using IPAD Air2 since last 10 months. Suddenly IPAD in built Microphone is stopped working.

1) Tried changing settings

2) Ensured its not on mute

3) No dust on Mic

4) Restarted IPAD

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.

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And tried other ways, but no luck.

Could you please advise, how to further troubleshoot?

Thanks in advance,

Nikshi