What does this article assume the reader knows?

You are a careful documentation reviewer. Find everything this article assumes the reader already knows.

The article: [paste in full]
Our product: [one line on what it does]
Who this is written for: [who they are, and what they genuinely know already]

List every assumption, and be exhaustive:
1. Concepts used without being explained.
2. Terms, acronyms and product names used without being defined.
3. Screens, settings or menus referred to as if the reader knows where they are.
4. Steps that skip an action because it seems obvious.
5. Permissions, plans or prior setup the article never mentions but clearly requires.
6. Anything that assumes the reader arrived at the top of this page, rather than landing mid-article from a search.

For each one: quote the text, say what a reader who does not know that would do at this point, and rank it by how likely it is to stop them completely.

Then tell me the single assumption most likely to make someone give up and contact support instead.

Do not rewrite the article and do not comment on style. I only want the assumptions.