Unable to use AdvancedMd login

[Dgraf]

First let me say I LOVE this browser. I use it all the time for general browsing. However - I am unable to use it to access my companies online Electronic Health Record and billing software. When I enter my credentials, and hit the log in button, It just returns me to the log in screen. Neither the website, or Vivaldi gives me any message. I have no problem with either Safari or Chrome. I have checked the privacy settings and do not see anything amiss. Any suggestions would be appreciated, as I would much rather use Vivaldi than the other two browsers. Thanks in advance Dennis Graf Co-owner Phoenix Family Center, LLC.