31952: Stream Extension not found:

Twilio couldn't find the Stream Extension referenced by your Voice stream. Stream Connectors are Add-ons for Media Streams, and an Extension describes the specific feature or API endpoint where an Add-on Listing can be used.

• You used a Stream Extension name that is invalid or not available for the request. Twilio's error guidance calls out using a valid Stream Extension.
• The extension is not enabled for the installed Add-on. Twilio disables Extensions by default and lets you enable them on the Installed Add-ons Extensions subresource.
• The extension is not available in the current realm. Twilio's error guidance says to try the Stream Extension in another realm.

• Use a valid Stream Extension name for the request.
• Try the Stream Extension in another realm if the extension exists there.
• Confirm the Add-on is installed and the Extension is enabled in Marketplace before you start the stream.

• Marketplace listings
• Installed Add-ons Extensions Subresource