Hi Patrick,
According leanix-docu you have to add the grant_type to the postbody.
You can do that e.g. in advanced mode with configuring parameter “postBody/grant_type” and the constant value “client_credentials” or by configuring the postbody via struct in standard mode.
For more details on how to configure the postbody see our documentation (https://community.simplifier.io/doc/current-release/integrate/connectors/rest-connector/rest-connector-calls/#1601990888609-6cd28084-0916)
For me it is not totally clear in leanix docu whether to use postFormat JSON or FORM. Just try both to see which one is working.
Have you already configured a login method with username “apitoken” and the apitoken as password and assigned it in the connector endpoint?
Kind regards,
Andreas