Solution #12: Close Skype on your device and restart it.

Solution #11: Check Skype Service Status for any disruptions.

Solution #10: Ensure there aren’t any file transfers in progress.

Solution #9: Close all apps that are using the internet.

Solution #8: Check if you meet minimum bandwidth for screen-sharing.

Solution #7: Know that you can either share screen or video when using Chrome.

Solution #6: Use a compatible web browser to make Skype for Web calls.

Solution #5: Verify that Skype has been granted Screen Recording access on macOS.

Solution #4: Understand whether your device supports Screen-sharing.

Solution #3: Check if Screen Sharing Button is grayed out.

Solution #2: Update to latest version of Skype app on your device.

Solution #1: Make sure you’re doing it right.

In that case I usually have to open 2 different browsers to get the sound to not echo. This can be troublesome if you are using a browser to do both generate sounds and record sounds. Make sure skype is not sending its output to Simultaneous or the channel you are recording from or it will generate feedback. However you could run another application that would take your mic and output that to the snd-dummy channel like sox -d -d echo 0.8 0.88 1 0.4 which you could even use to change the pitch of your voice. You will have to switch the skype input back to mic to talk and there isn't a direct way to record from both the mic and the snd-dummy. If you have no other devices, you can create a virtual one with modprobe snd-dummy Go to the recording tab and when you want to send a sound effect, change it to record from the Monitor of an audio device that Skype is NOT currently playing to (and not Simultaneous). Change its playback setting to the simultaneous output. Play the sound you want to play, and the application will appear here. Go into pavucontrol when connected to skype. This will allow both you and Skype to hear the computer sounds. In paprefs, go to the Simultaneous Output tab and check the box here. First make sure you have paprefs and pavucontrol installed.

Skype share screen and sound