REST API get list of report within workspace return just a subset of the list.

I am using this rest api call since 6 month to get list of reports in a specific workspace. It stops to work within 2 of my workspaces last week. The problem is: the API request is returning just a subset of the reports present in the workspace (1 out of 6).

- The query is done using a service principal

- It works with 1 workspace and no more working with 2 other workspaces.

- Can see all reports using Power Bi service UI.

- Service Principal is admin of the workspace.

- Service Principal is member of the security group that is authorized to used Power BI

(Allow service principals to use Power BI APIs Enabled for a subset of the organization)

Any toughts?