I have added ION API step to workflow, import service account and select operation without error. Then mapped result to workflow parameter. Finaly I click on Test link in ION API step and get error invalid_client.

I have tested operation of called API in browser and get correct result without error, but from workflow step I could not get working ION API step.
Can Anybody help me.
I use on premise installation of Infor OS version 12.0.26.