80616: Unsupported Identifier Type For Session Mode

This error occurs when you add a Participant identifier that does not match the Proxy Session mode. Proxy Sessions support message-only, voice-only, and voice-and-message. Proxy also supports non-phone channel identifiers for messaging use cases, but those identifiers must be used in a messaging flow that matches the Session mode.

• You created a voice-only or voice-and-message Session, then tried to add a channel or chat identifier instead of a phone number as the Participant identifier.
• You are building a messaging app or chat integration, but the Session was not created as message-only. Twilio's channel-based examples use channel identifiers in message-only Sessions.
• You reused an identifier or proxyIdentifier from a channel-based messaging setup in a Session that is expected to handle voice traffic. Proxy separates voice-capable and message-only session behavior through the Session mode.

• Check the Session mode before you add Participants. Use message-only for chat or messaging channel identifiers. Use voice-only or voice-and-message only when the Participant can be represented by a phone number.
• If you are using Proxy with messaging channels, pass the messaging app or chat value as the Participant identifier and use the channel or contact address as proxyIdentifier in a message-only Session.
• If the Session needs to support calls, recreate or update the flow so the Participant uses a phone number identifier, then verify your Proxy number pool includes numbers with the Voice or SMS capabilities required for that Session.

• Session Resource
• Participant
• Using Proxy with Channels