45206: Chat User is already a member of the Chat Channel

Twilio returned this warning because your request attempted to add a Chat User to a Chat Channel where that user is already a member. Twilio does not create a duplicate membership for the same user in the same channel.

• Your application sent the same add-member request more than once for the same Chat User and Chat Channel.
• Retry logic submitted a duplicate request after a timeout or delayed response.
• Your Flex integration attempted to add a worker or user to a channel without first checking existing channel membership.
• Concurrent requests in your application tried to add the same user to the same channel at nearly the same time.

• Check whether the user is already a member of the Chat Channel before creating a new membership.
• Update your application logic to make add-member requests idempotent so duplicate submissions do not trigger this warning.
• Review retry behavior in your client or server code and prevent automatic retries from creating duplicate membership requests.
• If you are using Flex, review the workflow or plugin logic that adds participants to chat channels and remove duplicate membership actions.
• Treat this warning as a non-fatal conflict when the intended result is that the user is already present in the channel.

• Twilio Chat documentation
• Twilio Flex documentation