Power BI Template App – Viewer users unable to access reports since 27 July 2026

Hello,

We are experiencing an issue that started on 27 July 2026 affecting multiple independent customer environments using the same Power BI Template App solution.

Summary

Since 27 July 2026, users with Viewer permissions are no longer able to open reports connected directly to the semantic model created during the Template App installation.

The reports previously worked correctly for several years without any issues.

The problem occurs when Viewer users access either:

• The published Power BI App

• Individual reports directly

Instead of displaying the report, the browser becomes unresponsive and eventually shows a message similar to:

"Page Unresponsive"

No Power BI authorization error, RLS error, dataset permission error or other service error is displayed.

The issue has been reproduced in both:

• Microsoft Edge

• Google Chrome

Behaviour Observed

Test Result

Pattern Identified

From our investigation, the behaviour is consistent across all affected environments:

• Only semantic models created through Power BI Template App installation are affected.

• Only users with Viewer permissions experience the issue.

• Contributors, Members and Admins can access the same reports without any problems.

• The issue is not related to Row-Level Security (RLS), as removing RLS entirely does not resolve it.

• Semantic models created manually in the same workspace work correctly for Viewer users.

• Composite models that consume the affected semantic model also work correctly.

• The issue affects multiple independent customer tenants using the same Template App solution.

What Has Not Changed

The solution has been operating successfully for several years across multiple customer tenants.

Immediately before the issue started, no changes were made to:

• Semantic model design

• Report design

• Row-Level Security configuration

• Workspace permissions

• Template App deployment process

• Report publishing process

The only observable change is that the behaviour started on 27 July 2026.

Request

Based on the testing performed, we believe this is unlikely to be a report design, semantic model configuration or security configuration issue.

The consistent behaviour across multiple independent customer tenants strongly suggests a possible Power BI Service regression affecting Viewer access to semantic models generated through Template App installations.

Could you please investigate whether any backend or service changes were deployed around 27 July 2026 that could explain this behaviour?

If required, we can provide:

• Workspace IDs

• Semantic Model IDs

• Report IDs

• Activity IDs

• Correlation IDs

• Example customer environments where the issue can be reproduced

We appreciate your assistance and look forward to your investigation.

Kind regards,

Nuno Duarte
Solutions Consultant