Hi neighbors- thank you for this information and your patience! The team has been actively looking into this and we will update you with more information once it's available. It appears this may be limited to Samsung devices with Timeline enabled, however, the team is still investigating. Please feel free to continue to send video examples and as much information as you can so we can relay the information to our team members. Thank you!
I also have the same problem, I have an Iphone XR and I can hear on my end fine, but the person standing outside at the doorbell can barely hear me speaking. It has been this way since setup and I do not see any feature where I can adjust this volume. This is not even helpful if the person can not hear someone talking to them.