When he logs in, he sees the app. When I do, I see no apps on the app menu, but I do see a Person page has been added that has the name of the app. It's a free trial version of the Scroll Viewport app. He installed 2 other apps from them which worked fine & I can evaluate those.
Some apps require additional permissions to be setup. Please reach out to your administrator and have him confirm that he has set up permissions properly. https://help-cloud.k15t.com/scroll-viewport/Permission-to-use-the-app.843515536.html
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