In my case I created a test user in a sandbox environment and can't delete it. It never appeared in the Admin Console at all.

Wait, there's no longer a way to delete users?  So if I'm working on a Fusion automation that's triggered by new user creation, then my testing will result is potentially dozens of junk user accounts?

I work with OP and wanted to post the resolution. Turns out that Workfront is requesting a user certificate as part of the IDP authentication process. This means you have to disable SSL decryption. Adding *.workfront.com to our decryption bypass list on our firewalls fixed the problem. 

We already have. 

It's working!!!2 small caveats:1. I'm getting emails but still no in-app notifications. Not sure why.2. I had to use this to add a note to a task:"topNoteObjCode":"TASK", "topObjID":"{<object id>}", I can't thank you enough!

I will definitely try this, assuming a note can be attached to a task as opposed to a project. My scenario is currently creating an update on the task, but I like your solution much better.

So... there's a field called "Users Historical Decisions" that gives us data of how many approvals each user has made over the last 12 months. Neat! With the new licensing model, going above a certain threshold will kick a user from a free license to the "Light" license. We're going to be billed for...

It's working, except that the users are getting emails but no in-app notifications, which seems very odd to me.

I have a few kinks to work out but initial tests look good. Thank you!!! That being said, there really should be a simpler way to do this.

A group in our org has 9 custom user fields on the Project object that are various points of contact for the projects. They also have a custom task status called "Released". The requirement is that, when a task is set to Released, those points of contact are notified. Each POC field may or may not b...