The first MMP-versus-MMF question is eligibility, not price. Marriott's Explore programme is for eligible associates and immediate family, while associates can add eligible friends and family through Marriott's verified process. The Bonvoy app shows the specific special rates an account is authorised to book. Marriott's Explore eligibility overview

What MMP and MMF represent

MMP and MMF are rate labels within the Explore experience. They are not public promotional codes and should not be treated as interchangeable. A traveller should use only the rate Marriott displays for that traveller's verified relationship.

Which rate is cheaper?

There is no responsible universal answer. Inventory and price vary by hotel, room, occupancy and date. When both eligible rates appear, compare them on the same stay and include taxes, resort or destination fees, cancellation terms and room type. A lower headline price can be worse if it is non-refundable or applies to a room you do not need.

Can the hotel reprice an unauthorised booking?

Yes. Marriott states that Corporate or SET code use without proper authorisation or identification may lead the hotel to change the booking to the Best Available Rate at check-in. Marriott's rate-code warning

Decision rule

Use the eligible rate visible in Marriott's verified special-rates section. If neither appears, choose a public rate or ask the eligible associate to resolve the relationship through Marriott. Do not pay a seller merely for a code; require written evidence of the authorised eligibility mechanism and a remedy if Marriott does not recognise it.

Frequently asked questions

Is MMP always better than MMF?

No. Eligibility comes first, and the available price and terms vary by hotel, date, room and occupancy.

Can I use both MMP and MMF?

Use only the rate or rates Marriott shows for your verified relationship and reservation; the labels are not interchangeable public codes.

Is MMF a public Marriott promo code?

No. It appears within Marriott's verified Explore special-rate experience for eligible relationships.