From the Terms and Conditions at
https://www.ihg.com/content/us/en/de.../hertz_earnapp
Originally Posted by ihg
Base rate includes time and mileage charges only. Taxes, tax reimbursement, age differential charges, fees, surcharges and optional service charges, such as refueling, are not included. To qualify for the 1,500 point bonus and the 500 points per day, rental must be booked through this site. Advance reservation required. CDP 22754 must be included in the reservation
If you didn't use the 22754 CDP , then you are not entitled to the bonus - or if it was a prepaid rate it would not be eligible
If you did book using CDP 22754 then go back to Hertz and point out that the terms only required a specific CDP and that no PC was required - alternatively, in this case, I would go to IHG and put in claim with IHG for the missing points , since it would be more logical to claim with IHG than Hertz for missing points to IHG