A 32606 Error is an indication that the <VirtualAgent> TwiML contains an invalid or unauthorized configuration for resuming an existing conversation.
Possible Causes
<Config name="resumeEndUserId"> element referenced in TwiML contains an invalid value
<Config name="resumeEndUserId"> element referenced in TwiML is not authorized to resume the conversation from the current Call SID
Possible Solutions
Check the value of the <Config name="resumeEndUserId"> element referenced in TwiML
Ensure the resume attempt is made from the same Call SID which created the conversation
Check the VirtualAgentProviderError included in the webhook to the action url or the Debugger message in Console for further information. For additional assistance, please contact Twilio Support.