The direct links Nissan has been sending me regarding my Arya reservation haven't been working. If anyone else is having the same problem, here's the workaround I found:
First and most important, DELETE all cached files and cookies from your browser. If you just want to clear specific files and cookies, you can search for anything with nissan in the filename.
Login to Nissan owner's site by using the "Login" button here:
Explore owners benefits at Nissan Owners. Download manuals and guides, log onto MyNISSAN account, and shop for accessories and parts.
www.nissanusa.com
Go to the reservation page here (it's the page for making a reservation - it does NOT show your own reservation):
Experience the Nissan ARIYA PREMIERE interior and exterior in 360 degrees and explore color options. Make it yours by reserving today.
www.nissanusa.com
Click the "Menu" button at the top right corner of the page.
You my get a message that you aren't logged in. If you do, click the login button. It will probably automatically log you in.
Now you should see the actual "Menu" buttons for your account along the top of the page, including "Reservation," "Gallery," "Showcase," and "Insider."