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The connection.name can only be used in the From, Subject, and Message fields.
For the Redirect To field, only the below three variables are supported as of the current design.
application.name (or its synonym client.name)
application.clientID
application.callback_domain (or its synonym client.callback_domain)
Please refer to this doc for details. And feel free to communicate directly to our product team using our feedback page and click on the Vote button. Thank you!