Bluetooth Headset cannot be used as both headphones and speakers

After searching through the internet, from the experiences shared by many, the setup is well identified and understood. For streaming audio use the 'Stereo' or 'Headphones' profile and for Voice calls in meeting apps, use the 'hands-free' profile which gives both output and input (mic).  

But the real problem is not resolved by anyone so far, i.e. when using the 'hand-free' profile for voice calls in meeting apps, the voice is deeply distorted, robotic, slow and unintelligible.  Why the hands-free profile does not work properly (expectation is at least a fairly intelligible voice) on windows 10 PC and for any of the meeting apps voice calls? 

There are some bluetooth headphones/earphones that actually works, but nobody can tell what specifications make it work, what is different on them than the others that doesn't work. Is it the bluetooth version? Is it the codec? is it the driver? 

So we are left clueless on selecting a pair that would work for voice calls on PC based meeting apps.

See my post.

Realtek bluetooth not Intel.

BT headsets of your choice.

I was having this same issue with my Aeropex bluetooth headphones.  It shows up as two separate devices, the regular headphones, and a headset.  If I wanted to use the microphone, then there was no audio.  The only way for it to work was to also select the headset option as the output device.  The only problem with doing that is you get downgraded to 1 channel audio with tape recorder quality.  It's absolute garbage.

So I figured out how to fix it.  Open up the Sound Control Panel which shows all of your devices with a Playback and Recording tabs.  Go to the Recording tab, and you'll see whatever microphone devices you have.  Select whichever one you're trying to use, and open up it's properties.  Once in there, go to the Listen tab.  You'll see halfway down it says "Playback through this device:" with a selection box underneath it.  Select whichever device you want your audio to play through.  Make sure you click on Apply or OK at the bottom of the window.

You should now have your bluetooth microphone working, as well as your bluetooth headphones, or whatever audio output you selected.  The only issue I've noticed so far is if you're on the Recording tab of the Sound Control Panel, then for some reason it cuts out the audio.  As soon as you switch to a different tab, or change priority to another window, then the audio should work again.  Just some weirdness with bypassing whatever restriction that is in place I guess.

It's July 2021 already and they still unable to fix this bluetooth earbuds/headphone stuff..... I am having this issue with my Mpow X3 earbuds... can't find a way through... In the end I gave out and purchased some cheap fake JBL earbuds from Aliexpress but surprisingly it works...

Can't really understand how this happened but I conclude it as below:

1. mostly genuine brand earbuds/headphones are having this issues
2. 2 Choices (Good Quality Audio but no mic OR bad/crappy quality Audio with mic)
3. Genuine Earbuds/headphones work great on phone
4. Cheap fake Earbuds/headphones still able to use "Good Quality" Audio with mic (even the fake Earbuds/headphones can't produce the audio quality like the genuine brand, it still sounds better than the Genuine brand on bad/crappy quality Audio with mic mode aka Handsfree AG / Headset Audio)

Just sharing some of my ideas, hope to get some clues to solve this issues ASAP.