First off, make sure your note 9 is up to date. Also, check out this video https://www.youtube.com/watch?v=1pUGLLURuaI there are also a bunch of cool videos regarding android OS to get the most out of it.
When I use my Note 9 on Speakerphone, the other party cannot hear me. Its almost as if the microphone automatically gets muted. Microphone works fine in normal phone mode and with other apps eg. voice recorder. Anyone else have this issue? and more importantly a fix? Thanks.
I recommend having the phone evaluated by a certified technician. You can use the following link to find a service center near you. http://bit.ly/2XERsky
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I'm not paid to endorse it, but Android Forums is a fantastic resource for users of all skill levels to master their devices. There's a forum for virtually every Android device on the market, including the Note 9. I suggest you check it out - learn things, and help others.