I have a 2012 R2 ADFS 3.0 server on my internal network and a 2012 R2 Windows Application Proxy in my DMZ. I have published two web apps. My issue is a double login prompt at the ADFS login page. I enter my email and password and login. It immediately reloads the same login page. I enter my creds again, and then it takes me to the web app. Both logins appear successful. There is no indication of incorrect creds.
This issue only happens for one of my web apps. The other web app only prompt once like its supposed to do. Both web apps are hosted on the same internal server.