In Thunderbird:
   
       Tools -> Options:
           General:
               "Play a sound" and "Default system sound for new email" are both checked but clicking the "Play" button does not produce any sound.
       
       Add-ons:
           I tried installing and configuring the "Mailbox Alert" add-on but still got no sound so I removed it again.
   
   In Windows:
   
       Settings -> Sounds:
           Advanced sound options:
               Mozilla Thunderbird is listed with the default settings, same as everything else that does work.
           Related Settings -> sound control panel -> sounds:
               Desktop Mail Notification and New Mail Notification both have Play Windows Startup sound checked and the "Test" button when clicked there does play the sound
   
       Notifications & actions:
           Thunderbird is not included in the list under "Get notifications from these senders", I don't see any way to change that, and from what I've read that is to be expected.

When a new email arrives on my Windows 10 lenovo laptop I get a pop-up visual notification from Thunderbird 68.8.0 but no sound (yes, my speakers are on and the volume turned up). I have checked/tried the following: In Thunderbird: Tools -> Options: General: "Play a sound" and "Default system sound for new email" are both checked but clicking the "Play" button does not produce any sound. Add-ons: I tried installing and configuring the "Mailbox Alert" add-on but still got no sound so I removed it again. In Windows: Settings -> Sounds: Advanced sound options: Mozilla Thunderbird is listed with the default settings, same as everything else that does work. Related Settings -> sound control panel -> sounds: Desktop Mail Notification and New Mail Notification both have Play Windows Startup sound checked and the "Test" button when clicked there does play the sound Notifications & actions: Thunderbird is not included in the list under "Get notifications from these senders", I don't see any way to change that, and from what I've read that is to be expected. I have no problems with any sounds from my laptop. What else can I check/do to try to get a sound out of this thing when an email arrives?