This has been our workaround since the documented method to use client ID/secret from the Workfront OAuth App results in the error message @marty_gawry shared  Because of this and the struggles we've experienced, I added an idea in the Workfront Idea exchange related to this. https://experienceleagu...

Description - Currently, you need a username and password with System Administration access to Workfront in order to create a connection to Workfront. Would like to use an OAuth machine to machine app credentials. Why is this feature important to you - Most IT security offices we work with are reluc...

Yes, this is a frustrating change.