In my case I went through all of the usual trouble shooting steps:
- Reset the browser to factory
- Try IE and Chrome
- Uninstall all Pulse software and clean the registry
- Manually install all Pulse software
and then I spent the better part of a week with Pulse Secure technical support when it hit me that it might be a permissions issue. I had added the Pulse software into a Windows 10 1803 lab PC, then used SYSPREP to have it build an image, then I uploaded it to a Windows Deployment Services server.
The solution was to change the permissions on C:\USERS\<WDS account> to AUTHENTICATED USERS = FULL CONTROL. <WDS account> is whatever name you used to build the profile in before SYSPREPing it.