Where do I find my OTC Monograph ID Number (Previously called OTC "Part Number"?

Answer:

You can also refer to the CFR to ensure that your OTC Monograph ID Number is correct:
https://www.federalregister.gov/documents/2021/09/21/2021-20393/final-administrative-orders-for-over-the-counter-monographs-availability 

The current OTC monographs are posted in the OTC Monographs@FDA portal at:
https://dps.fda.gov/omuf/

The FDA has compiled a list of OTC Rulemakings here:
http://www.fda.gov/Drugs/DevelopmentApprovalProcess/DevelopmentResources/Over-the-CounterOTCDrugs/StatusofOTCRulemakings/default.htm