Hi

project task is to get connected with Customer DocuSign account to send some contract data (External system will sign it etc etc).

I did set up a REST api, triggering it with  Postman would work, if I do it via PEGA it returns me error (see also Error Message attachment) :

{"error":"invalid_grant","error_description":"unsupported_grant_type"}

Rest connector is using AUTH 2.0 authentication profile with JWT bearer grant type, everything seems to be set correctly. 

Attached (successful Postman request) the same request from Postman would work.

Any idea what the reason for such error could be?

Thanks in advance

E.