Here are some solutions:
- Reconnect the streaming platforms.
- Refresh the page.
- Restart the browser.
- Open system log on control panel to see if there are any error messages.
- Try open our alteranate websites https://www.speechchat.com and https://beta.speechchat.com.
- Try open our website on other browsers. We mainly do testing our website within Google Chrome.
- Restart the computer.
- Our server or the streaming platforms' API servers may be under maintenance, please try again later.

Here are some solutions:
- Please make sure the voice, the user group and the !speak command settings are correct.
- Refresh the page.
- Restart the browser.
- Open system log on control panel to see if there are any error messages.
- Restart the computer.
- Reset all settings. You can find this option on "Platforms"->"Google Drive"->"Options".

It relies on the OS and the browser support.
You can follow the links below to see how to download more voices on Windows 10:
https://support.office.com/en-us/article/how-to-download-text-to-speech-languages-for-windows-10-d5a6b612-b3ae-423f-afa5-4f6caf1ec5d3
or
https://support.microsoft.com/en-us/help/22797/windows-10-narrator-tts-voices

You can choose which sound device to output 'Microsoft TTS voice' through the "Control Panel"->"Speech Recognition"->on the left panel click on the "Text to Speech"->click the "Advanced..." button.

This article provides more details on how to exclude audio sources off your stream.
https://obsproject.com/forum/resources/how-to-split-exclude-seperate-audio-sources-off-your-stream-or-recording.8/