I'm going to rant for a moment because the documentation on the Proofing tool is so abhorent.
At first the excuse was that it was a pretty new integration and they were working on it. But now it's been a couple years and this should be worked out. There is literally no place on the help website, nor can you get a straight answer from support as to how each license level gets access to the integrated Proof - the only documentation is for standalone proof -- and the license types are completely different so there is no one-to-one relationship. Why is this so hard? Why do I have to have a phone call and 3 emails to find this out? It seems like the most basic of questions.
Thank you for listening, I needed this outlet to vent.