It seems like Google and Huawei have some real problems recently. There was an issue with bending and glass shattering of Nexus 6P. The phone was manufactured by Huawei for Google.
Today, we heard about yet another problem with the device - poor microphone quality.
Users are reporting that the person they are talking to can''t hear them properly. It does not only happen in regular voice calls, other types of calls are also harmed, Hangouts for example. Earpiece mode doesn't always help, as some users have experienced problems while using headphones. Google Forums, reddit and xda are filled with complaints.
Google is aware of the situation and is currently working on a solution.