I am trying to figure out what is causing the problem, but haven't solved it yet.
Essentially, I am using domain mapping on my multisite. I have run some tests by Directing to original domain and primary domain. I have also tried using exceptions on URLs.
Cross-Domain Login is disabled
Administration and Login mapping are set to domain entered by the user
Force HTTPS are both set off
I am enabling your Support, the site in question is Bassett Biomechanics.
Thanks for the help!