Quick reference:
Settings -> App store
Step 1. Configure the app
Log in as an administrator in Workspace 365.
Go to the App store.
Make sure Manage apps is selected.
Click on Add new app.
Add a new Citrix XenApp.
Customize the application to your needs and fill in the Server URL and Citrix app name.
The Server URL is the URL of the Citrix server (gateway).
Keep in mind that the Citrix app name is capital sensitive.
The Citrix app name must be equal to the published app name.
Lastly, you can set the desired permissions, Owners, Access and Conditional access for the application.
Click Save when you're done configuring the app.
Step 2. Activate the app
Now that the Citrix XenApp is published and is available in the App store, it can be added to Workspace (either to a Personal or Shared group).
Click + Add tiles (to workspace) to add the app to Workspace from the App store.
When added to Workspace, right-click the tile to edit it to your liking.
Don't forget to click Save when you're done.
App links
For Citrix XenApp applications, it's also possible to create app links from the App store by editing the remote app. An app link is an unique URL that links directly to that specific application. By using this unique URL in the creation of shortcut apps, you allow users to gain direct access to those applications when they click on the shortcut app.