Embedded Quicksight dashboard not displaying on Web platform

There are a few things to check to troubleshoot the embedded QuickSight dashboards not displaying in your web app:

1. Double check that the IAM permissions for the Cognito identity pool role allow access to QuickSight i.e. "quicksight:DescribeDashboard", "quicksight:DescribeDataSet" etc.

2. Make sure the QuickSight reader or author ARN is authorized to view the dashboards in the embedding parameters.

3. The error about "X-Frame-Options" suggests the QuickSight dashboard was not properly configured to allow embedding. In QuickSight go to the dashboard settings and make sure "Enable embedding" is checked.

4. Try setting the QuickSight embedding container style to "Seamless" if it is currently "Default".

5. Verify the region being used for embedding matches the QuickSight dashboard region.

6. Try logging the QuickSight embedding status/errors server-side to see if any other issues are being reported.

7. Check the browser console for JS errors during embed load.

So in summary, the key steps are confirming the IAM permissions, QuickSight embedding is enabled with seamless style, regions match, and author is authorized. Let me know if the dashboards still do not appear after verifying those!