Thanks for the feedback, Paul.
Here is the link to the site: 9Line (9linellc.com)
Before, when I clicked on EMPLOYEE PORTAL it would take me to the Sentry login screen. Now, it just directs back to the homepage.
In Squarespace, the portal is in Secondary Navigation and the link works there. In General Page Settings, nothing was edited and it all looks correct.
I'm not sure why the portal link stopped working. Any ideas? Thanks.