Hi Daniel,
The same issue occurred to me with a fresh instance of version 2.40.0.1.
This is how I resolved it.
- Log in to the dhis2 instance.
- Access the App Management app by manually entering the URL (in your case http://10.50.80.76/dhis-web-app-management/index.html)
- Select Core apps on the left
- Select each Core app with updates available and update to the latest version. (including the Dashboard app).
- This resolved my issue. Hope it will resolve yours too