Getting "Access to the resource is forbidden" error when creating report "GET_FBA_FULFILLMENT_CUSTOMER_SHIPMENT_SALES_DATA"

[nonfatalexec]

I'm getting this exception
sp_api.base.exceptions.SellingApiForbiddenException: [{'code': 'Unauthorized', 'message': 'Access to the resource is forbidden', 'details': ''}]
when trying to create the report "GET_FBA_FULFILLMENT_CUSTOMER_SHIPMENT_SALES_DATA".

Here is the code snippet:
report_request = reports_api.create_report(reportType="GET_FBA_FULFILLMENT_CUSTOMER_SHIPMENT_SALES_DATA", dateStartTime=str(date.today() + dt.timedelta(days=-days_ago))+"T04:00:00", dateEndTime=str(date.today())+"T04:00:00")
A similar code has no issues:
report_request = reports_api.create_report(reportType="GET_FLAT_FILE_OPEN_LISTINGS_DATA", dateStartTime=str(date.today())+"T04:00:00", dateEndTime=str(date.today())+"T04:00:00")

I have these roles in my app:

Finance & Accounting
Selling Partner Insights
Buyer Communication
Pricing
Inventory and Order Management
Brand Analytics
Amazon Fulfilment
Buyer Solicitation
Product Listing

How should I debug this?