I think my issue is slightly different than Cameron's. I can't even get that far to finish the install and configure with the modern app.
When I select the 'Make this solution available to all sites' option, nothing happens. The app appears listed in my App Catalog and shows no errors (see screenshot above), however the app is not deployed to any sites or appear under Site Contents>Add an app so no one can add it.
If I try to add to a single site collection, the app is added and appears in Site Contents, however I cannot click on it to get to the configuration page. Clicking on the app has no action. If I look at the ellipses, I only have options for 'Details', 'Monitor' and 'Delete'.
I saw other earlier posts in this community with the same issue and the guidance was to make sure you were a site collection admin. I am a site collection admin and still nothing. This behaviour is with the modern app only. I had no problem installing and configuring the classic maps app.