1. Licensing

2. App Installation

2.1 Unable to install in Sharepoint Server 2016/2019

When trying to install RadiantQGantt app in sharepoint server 2016/2019 you get a error saying "Sorry, apps are turned off. If you know who runs the server, tell them to enable apps."

There are several scenarios on which this error might happen. Some of them are listed below:

2.1.1 Configure the Subscription Settings and App Management service applications