Powerapp working in Studio but not via app link

[jensmurer]

Hi,

we created a Powerapp from a Sharepoint list, changed a few things and everything works as expected in Studio: Fields are validating, data is written back to the Sharepoint list.
We saved and published, got the app link and tried to put it onto the Sharepoint site's main page as a Powerapps webpart. But from this we get an error message "Failed to retrieve PowerApp details".
When calling the app link directly Power Apps gives the - loosely translated - message "This app isn't working anymore. Pleas refresh your browser or try again later." The only detail information we get is the session id.
We tried to re-publish the app (still working in Powerapps Studio) und share it with the whole company (which actually IS the scope of the app ans Sharepoint list), but to no avail.

Is there some way to get additional error details by the session id?
Or does someone see the error in our process?

regards

Jens

[jensmurer]

To clarify, when I write "Studio" I mean the web interface https://eu.create.powerapps.com/studio/, not a desktop application