PowerBI Dataverse Error Message

Good Day :),

I downloaded an (.pbids) based on a Teams APP, which i created with Powerapps. I successfully connected to the Dataverses of the APP with the PowerBI Desktop Application. I Published the App so that i can Access it via Web and Teams PowerBI.

Unfortonately the PowerBI Report is returning me Issues regarding accessing the data (Checkout the Screenshot).

I clicked on "More Details" but its not very helpful. It seems that the i dont have Credentials or Permissions to access the Dataverse from PowerBI in Teams.

Could someone help me to figure out whats the Issue and how to fix it? 🙂