Error 90403
Product: Understand
ERROR - 90403
[Autopilot] Signature validation failed
Signature validation is failed.
Possible Causes
The account owns the messaging/voice service does not have any parent/sub-account relationship with the account owns the Autopilot assistant.
Possible Solutions
Moving the assistant (export and import) into the service account or service account's one of the sub-accounts would solve the problem.