Person on other end can't hear me while my speaker is on

[NewJoe]

Hi,

 I have the problem with my S10 that the person on the other end can't hear me while my speaker is one.  

 Once i turn off speaker they can hear me clearly, but once it is on it has exactly the same functionality as the mute button 🔇 

 Any advice?!

[KholaI]

This does sound a little odd, but let's get this sorted for you.

Please dial *#0283# > Tap on 'Start: SPK_2ndMc > Speak into your phone as you would if the call was on loudspeaker. If you're able to hear yourself clearly, it means there's no issue with the phone. But if you're unable to hear yourself, please reach out to our Support Team as your phone may need an inspection:

https://www.samsung.com/uk/support/contact/