Microphone Not Working In Skype

I have installed the Snapcraft version of Skype on a PC that runs Fedora 27 (Workstation Edition), 64-bit.
The microphone option does not work. I tried many times to test it with Skype but no luck.
I know that there is nothing wrong with the microphone because I have installed Skype on another partition of the same PC that runs Ubuntu LTS and everything works just fine.
Does anyone know what needs to be done in order to get the microphone to work with Fedora?

PS: I have the same problem with Debian…

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Same here on openSUSE Tumbleweed 20180530. It actually worked at first, but not anymore.