Hi, This is my first android experience and there is something that really annoying me, can you help please.
My earbuds first generation connected to my mobile and I can listen to Spotify or YouTube and do the normal calls.
But when doing a video calls on any application (WhatsApp, Zoom, ToTok..etc), the voice will come out from speakers.
I tried the following to fix it till now and nothing worked:
1- checking settings. and resetting network settings, updating everything and updating earbuds as well
2- clear cache/data
3- reset to factory settings, for the mobile and the buds
4- I tried to use my earbuds on other mobiles it works perfectly
5- I tried to use other earbuds on this mobile, it worked better that my galaxy but voice will be like electro-voice sometime
6- tried to connect using wearable or without.
7- I tried to turn off A2DP from developer menu
8- please don't give solution as "recharge earbuds for 10 min minimum"
9- CS are not there for me, I hope we will fix this in this community 
@ZTD @Nikitosik: With your Buds connected, head to Settings > Connections > Bluetooth > Tap the cog symbol to the right of the Buds, and make sure that Calls and Media are both toggled on. Now, head to Settings > Apps > WhatsApp (as an example) > Permissions, and allow all permissions. Furthermore, swipe from the top of the screen to the bottom using two fingers while WhatsApp is open > Media, and make sure that your Buds are selected, and the volume slider is at a suitable level. As suggested by @CarlH it is also worth checking the in-app settings for any audio output options while on video calls.
