@jeffz8 thanks for the information!
(1) On my adsense page (I assume you are talking google.com/adsense) I have Home — that has a message about reviewing. Sites is greyed out. I cannot access that.
Yes that is correct. It sounds like your account/ site is still under review. We do not have access to this part of the process, so are limited in support. It may be a matter of waiting (see this article for reference- note that Site Kit has placed the code for you). You can also reach out to the experts at the Adsense Help Center for further assistance.
Furthermore on the adsense page every page is blank. I mean completely blank — just white space.
Does this persist when you visit your Adsense account directly in a new browser window?
There is a known issue when visiting links to Adsense within Site Kit that we’re working on fixing.
(2) How can I tell. I press the button — configure and I get an error. There is no place to enter an account.
When you visit your Analytics account directly in the browser (perhaps in a new tab or window) is it accessible?
In regards to the error, this typically affects users that do not have an Analytics account yet. We’re actively working on resolving the issue here, so it would be good to confirm if your current Analytics account is being detected or not.