Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Dear Pleskians! The Plesk Forum will be undergoing scheduled maintenance on Monday, 7th of July, at 9:00 AM UTC. The expected maintenance window is 2 hours.
Thank you in advance for your patience and understanding on the matter.
Regarding license issue you can as assistance here Licensing and Purchase support
In the error message everything is written about what the correct hostname should be. Check that it meets these requirements.