Embedding a Power App in PowerBI issue - data not moving over

Sounds like the column you want to access isn't actually being exposed to the app. The Power Apps visual has its own "Power Apps data" field well in the Fields pane, separate from your matrix. Cross-filtering from the matrix narrows down the row, which is why CountRows changes from 1000 to 1, but only fields you explicitly drag into the Power Apps visual's data bucket are added to the schema of PowerBIIntegration.Data.

Open the Power Apps visual on the report, look at its Fields pane on the right, and make sure your ID column is added there. Then inside the app, reference it as First(PowerBIIntegration.Data).IDColumnName using the exact name shown in the bucket. After changing the fields on the visual, edit the app from the visual, save, and republish so the app picks up the updated schema.

If that resolves it, please mark it as the accepted solution and give a thumbs up.

Thanks,
Shai Karmani

Let's connect in LinkedIn