14218: Dial->Queue: Could not update worker to provided activity

You see this error when <Dial><Queue> cannot find or accept the reservationSid provided for a TaskRouter call bridge. When you bridge a call with reservationSid, Twilio marks the pending Reservation as accepted; if the Reservation is invalid or has already been accepted, the dequeue attempt fails.

• The reservationSid is not valid for the pending Reservation that <Dial><Queue> is trying to bridge.
• The Reservation was already accepted through the TaskRouter REST API or an assignment instruction before the bridge happened.
• The linked Task state was modified before TwiML could manage the reservation lifecycle.

• Pass a valid pending Reservation SID in reservationSid when you bridge the call with <Dial><Queue>.
• Accept the Reservation only through the <Dial><Queue> flow, and avoid accepting it earlier in your application or in TaskRouter.
• If you execute additional logic before bridging the call, keep the Reservation pending until the bridge occurs and set a long enough Reservation Timeout for the workflow.

• TwiML Voice: <Queue>
• Queueing Twilio calls with TaskRouter
• Error and Warning Dictionary