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This may work for some but I think the reality is if you've already reinstalled WhatsApp multiple times, both Reset and Repair (even if it were available) would likely have the same effect. They all aim to restore the app to a default state, and clearly, the issue goes deeper than just corrupted files.
That reinforces my original suspicion: it's almost certainly a compatibility issue between certain versions of WhatsApp and specific PC hardware or drivers — especially considering it works fine on my older machine with the same mic/camera setup.
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