How do I Set Up the oauth2 Redirect between my Sharepoint integration with Workfront?

Greetings Workfront Community!

I recently inherited a Workfront Instance, and I'm looking for some council to give to my IT department. I have everything set up properly for the Sharepoint Instance, and my IT department gave me the client ID, and secret PW. However, my IT department did not set up the redirect, which was: "...oauth.my.workfront.com/oauth2/redirect"

So I gave him the updated info to our instance for the redirect and replaced everything. However, I'm still getting the same error, and the URL above is still populating the missing redirect error message.

Is there a delay for it to cascade through the www? 

Am I missing anything? if someone has any insight I could share with my IT department, I'd be eternally grateful. TY!