16027: Participant to be whispered is on hold

This error occurs when you try to add a coaching participant to a conference participant who is currently on hold. A participant on hold is not available to be whispered to until that participant rejoins the active conference.

• The participant identified in callSidToCoach is on hold.
• The participant identified by the TwiML coach target is on hold.
• Your application tried to enable coaching before the participant rejoined the active conference.

• Take the target participant off hold by updating the participant and setting hold to false before you add the coach.
• Confirm the CallSid you use for coaching belongs to a participant who is still connected to the same active conference.
• Verify that your application is targeting the correct conference and the correct participant before you enable coaching.
• If you use <Conference> with the coach attribute, make sure the participant you want to whisper to is an active participant and not on hold.

• Conference Participant resource
• TwiML <Conference>
• Voice Conference overview