Speaker mode not working (Recipient cannot hear me)

Hey all

Have an issue where when I use speaker mode to talk on the phone, the person recieving the call cannot here me, this renders skype useless as well. Has anyone had this as a software issue or would it be hardware related?
Regular calls work fine so I’m not sure why the microphone isn’t functional for this feature.

Thanks

I have similar issues with hangouts and Viber video calls.
People can hear me, just its quite.

I think the software is not switching to the external mic at the top when on loud speaker / video calls.
It remains using the bottom mic, which generally gets covered by a desk etc.

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