I have the problem and I'm almost %100 those with deep voices are probobly expierincing the issue... See this link for my description of the problem I have.
After spending half a day trying to figure out this issue I’ve finally fixed it!! I read everyone’s suggestions on many different sights and not one worked. I felt like a moron once I figured it out lol. When you are setting it up to recognize your voice and tap the button it ask you, which you do then you actually have to hold the side button when talking. Yup that’s it!! So simple yet frustrating as crap. Good luck everyone. ~Larry
It is now 2018 new device S9+ and still same issue as reported in this thread a year later.
So Samsung what is the deal with releaseing faulty equipment at least make the issue known to user's before they purchase your So called Flag ship device, Bixby has been terrible since launch, Yes by design its seems to be great when it works but in fact it should be scrapted.
Your loosing customer with this No fix issue.
I'll be returning by device for ful refund, Maybe next model will be right but again Bixby has put such a bad tast in my thoughts of it that I am just going to bypass the manufactre Samsung all together, At least Google and apple got their voice reconize software right, Samsung has had time and yet it is still going on.
Hey anyone having problems with Bixbi Voice ??? My wife was having the same problem and she did all the bull Samsung suggested and guess what??? It didn't work!!! Then she cleaned out the microphone with a tiny brush and low and behold! It worked like a charm! She's a genius!!! It actually happened to her twice and both times it worked!!! Maybe dust or something got in the microphone! Try it! If it works? pass it on!
I bought a new S10+ yesterday and Bixby Voice was Not Working, I had to yell and it might work now and then. Seems T-Mobil cloned all my old stuff to the new phone as they do and my Panasonic home phone system has bluetooth and I can answer my cell on any house phone, a great system as I just leave the cell on the charging pad and never have to go far as I have about 6 phones all over the house.
Here is what I did to get Bixby working where I can just wisper the name....I removed the bluetooth link in the cell and removed the bluetooth links in the house phone and had them find each other again and bingo! works great. It did not matter if I was home or not it just would not work.
Instructions for the Panasonic system
You can cancel the pairing of a cellular phone that is stored in the base unit.
This does not work. Samsung has no idea how to fix it. So, the voice activation feature in the standard Samsung photo app cannot be used. Samsung has no idea this has happened, or how to fix it.
The fix given below is not available on the S9. What does work?