45203: Requested Chat User not found

Twilio could not find the Chat User requested for a Chat Channel operation. This error usually means the Chat User was deleted, was never created, or the request referenced the wrong user identity.

• The Chat User for the agent or end user does not exist.
• The request uses an incorrect Chat User identity or SID.
• A custom implementation deleted the Chat User that Flex expects to use.
• User provisioning or identity synchronization did not complete as expected.
• An agent signed in with identity data that does not match the existing Chat User record.

• Verify that the Chat User exists for the identity used in the request.
• Confirm that your implementation passes the correct user identity and any related Chat Channel identifiers.
• If you manage Chat Users outside of Flex, make sure your application does not remove users that active or future conversations depend on.
• Retry after confirming that user provisioning completed successfully.
• If you use single sign-on, verify that the user profile information synchronized from your identity provider is correct and consistent.
• Have the agent sign in again if the user record may not have been created or synchronized correctly.
• Review any custom Flex or backend logic that creates, updates, or deletes Chat Users.

• Flex documentation
• Programmable Chat documentation
• Set up single sign-on for Flex