Not able to Access /admin on Omeka Classic with Curatescape theme

Returned to a project that had been stable for a while.
When I tried to get to the /admin page, I got a 404 Error: The page you are looking for does not exist.
This is a Omeka Classic set up with a curatescape theme and plugins and it is hosted at reclaim.
Thanks for any direction on how to proceed.

One thing I would check is if /admin/ works (with the extra slash at the end) or if the full path /admin/users/login works. I’ve noticed this is sometimes an issue, probably due to some change in the .htaccess file.