Undesired noise might be heard due to incorrect device configuration.
[Device configuration]
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When more than one microphone is connected, howling may occur due to multiple sound inputs. Disable all unused devices except the connecting one.
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Noise may occur when microphone and sound output strength are different. Try configuring the recording and playback device to the same HW.
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In a public place, try wearing earphones before joining a meeting.
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Howling is likely to occur if you choose to output sound through the speaker of another device while using a speakerphone. When using a speakerphone, set the microphone/speaker to the same device.