50433: Participant already exists

The requested Chat participant is already mapped to a conversation.

• You are attempting to add a Programmable Chat participant to a conversation that already has another participant with the same identity.

• Retrieve a list of existing participants in this conversation and remove the one with the same identity using REST API.
• Perhaps it's not an issue, and we can continue as-is. Instead of adding a new participant, reuse the existing one, potentially update its attributes if necessary.