FAQ: Open Report Launcher on the web engine HTML screen
This issue occurs due to cross-site scripting, causing the second HTML screen to be blocked and display a blank screen.
It needs to check in IIS if report launcher SSL settings is on "Ignore".
And also web engine SSL setting should have the same setting -> "Ignore"
Then you can open the project with computer name and HTTPs and web engine deployed name on the browser.
For instance: https://(PC-Name)/HTML
Here, HTML is a web engine deployed name.