@Muad-Dib 

Please check if the microphone port on the camera is blocked or obstructed. Have long have you been using this doorbell? When did you notice this problem?

Can you share some videos of the problem here? *Upload the video to your personal cloud drive or YouTube, then send a link here or to me through private message. 

Muad-Dib wrote

  @Muad-Dib Still having issues.  I can hear the doorbell ring on the chime and the device and when auto responding with a message etc it comes out the speaker fine however the mic is not picking up any sound at all.  I have carried out a reset and removed/readded the doorbell in the Tapo app but nothing working.  I hav checked the mic is not muted and have even turned up the mic volume right up but still not hearing anything.  I have tried to log a support case with Tapo but am not getting anywhere. Help!

  @Muad-Dib 

If your feedback is submitted within the Tapo app, you'll receive an auto response with suggestions for your case and the follow-up guidelines. Did you follow the guidelines to reply to the email and correct your case details or provide additional information? 

“If you still have unresolved issues or if there is a misunderstanding regarding your question, please kindly reply to this email and provide the troubleshooting steps you've tried, error message screenshots, or videos. Then our agents will reply to you with the solution after analyzing the information you provided.”