There is a discrepancy between the partner's customer statements and the cost reported under the customer tenant.
One possible reason is that not all payer accounts are configured through Partner Generated Billing (PGB); some payer accounts have been set up directly under the customer tenant.
1. Determine the number of PGB Blocks/Payer accounts configured under the PGB configuration for the customer.
2. Review the Flex report under the customer tenant to ascertain how many payer account costs are reported.
3. A mismatch between the number of payer accounts configured under the PGB Block and the payer accounts listed in the Flex report may indicate accounts configured directly under the customer tenant rather than through the PGB configuration.