21655: The ContentSid is Invalid

The ContentSid you are using is not valid

The ContentSid you are using is not valid:

• The template sid you are using has been deleted from the account
• The template sid you are using is being used on the wrong account sid
• The template sid you are using does not exist. (Usually this indicates a typo)

Double check the ContentSid parameter that you are using.

• Make sure it has the proper formatting and starts with an HX prefix.
• Make sure it exists, has not been deleted, and is for the right account sid.