Yes, same problem. My phone arrived Thursday and I just noticed today the microphone ONLY works when making a phone call with speaker phone enabled. Bluetooth on/off makes no difference, safe mode makes no difference. Once speaker phone is toggled off the mic stops working and will start working again once speaker phone is enabled. Removing my case has no effect. Disabling the squeeze to activate Google Assistant also has no effect, mic still won't work. Mic doesn't work when recording videos or manually launching the Google Assistant.
Google offered to send me a replacement this week.
