After looking high and kow, I called Samsung Tech support and figured it out. I have Verizon Note 8
1) Go to phone Settings
3) Scroll down to Bixby (there should be 5 apps that starts with Bixby)
4) For each Bixby app, delete data and force stop
5) Open Bixby and set up Bixby voice
You may be able to reset your voice password by going to Bixby Home > Settings > unlock with Voice Password. From here you will be able to delete a voice password.