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Another Users Device Might Be Causing. Make sure the device they are using is optimized for Skype for Business communications software. Ask others on the call to do the following.
If they are using their webcams microphone or computer speakers ask them to try using a different audio device. Right click on the command prompt icon and select Run as administrator. Type command prompt in the search bar on the Taskbar.
Turn down their speaker volume to reduce the echo.
Make sure the device they are using is optimized for Skype for Business communications software. The Users may join devices to Azure AD setting is set to None. Now type net user to get the list of users on the computer. It prevents new users from joining their devices to Azure AD.