Hi! I have the same problem. Both mics work, but video calls seem to use exclusively MIC2, which is too weak to be heard. Is there a way to just disable that one? I would rather try no background noice reduction than this. Video calls are right now one of the main uses for my phone, and if it doesn’t work I will have to returne the FP3 
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I had hoped the last update would be able to fix it but no…