Gmail message sent to Open Connector fails in iFlow, but is successful from API Docs

[Bobito_Jordan]

Hi,

I've created very simple iflow based on an example from SAP Help:

using Open Connector for Gmail to send a test message:

It fails with error code 500 when I call the iflow from Postman:

but it is successful when called from API Docs:

and the received email:

I'm using version 3.42.0 of the Integration Suite.

I can't figure out what mistake I'm making in iflow.

Thank you in advance for any help you'd provide.

Regards, Robert