You can get your cert back. Make sure to call Marriott Rewards department and not the general reservations. Make it clear it was their error. With this TP cert fiasco whenever I have pointed out the problems were all due to Marriott's error(s) they helped me, eventually. The first time they botched up when the agent said there was nothing she could do to fix Marriott's mistake I told her in no uncertain terms that she would need to connect me to a supervisor which she did and the supervisor then "fixed" it. And, by "fixed" it, I mean he thought he fixed it but he made a mistake and had upgraded my package from an OC8 (NC5) to an OC9 (NC6) and charged me 30k points for the upgrade which was wasted on me since I only needed an NC5 hotel. But, at least he tried and a few days and many calls later I am whole again with my replacement NC5 cert in my account and points exactly where they were before they cancelled my cert.

I was able to call to downgrade my OC8 and received 30k points refund.

• Description: PARTIAL PACKAGE - 7 NIGHTS CATEGORY 5
• Reward code: QP91
• Valid through: Tuesday, August 27, 2019
• Total points redeemed: 105,000
• Confirmed on: Monday, August 27, 2018

In fact, I agree with that. Without the 1:3 conversion policy, we weren't able to see the surge of lots of floating 7 night certificates in the last few months.
Marriott was also very generous turning SPG gold which is virtually useless into Marriott gold which is lot more useful.

Attn: Marriott competitor
 

This idea may be a bit crazy, but a savvy competitor could swoop in now with a marketing coup. - Just ask us to surrender our Marriott certificates for equivalent certificates (or points) in your program. Logistically, it's easier than most status matches. To start, just have us book a 7-night award stay checking in tomorrow, which would automatically be nonrefundable. Then, the member can cancel the award and email proof of cancellation. (Or you can ask us to close out our Marriott account, but I'll need more incentive to give up my Lifetime Marriott Silver.)

Why would a hotel chain want to give you a 7 night stay for free, exactly?

Status matches work because it is only marginal costs which arise only when you stay with them. They are not going to foot the bill for 7 nights of free stays.

Wyndham very briefly offered a 4 to 1 match for SPG members that donated their points to charity instead of transferring to Marriott. It was cancelled after a couple hours - presumably due fraud issues. So - not completely out of the realm of possibility.

Besides, Wyndham is Ramada, not in the same league as Starwood, and Starpoints (or three Marriott points) were worth more than four Wyndham points each in redemption value, so you'd actually lose value by making the exchange. The exchange rate would have to be 1:5 or better IMHO

Poaching Starwood members may have been a good idea, but suffered from the implementation.

Presumably the fact that: 1. it was Wyndham, and 2. it was cancelled after just hours, shows that the same deal is not going to be offered by any credible competitor to the combined SPG/Marriott chain.

Bear in mind that we are talking about anything up to 7 nights at the chain's most expensive properties. That's one heck of a customer acquisition cost, in exchange for what?

I edited the Wiki.

It appears NC4 is QP83, NC5 is QP91, NC6 is QP99. Assuming my original guess is right, NC7 is QP107.

Happy received a NC80 which coded as QP80 which seems to be a special case.

Thanks! With the amount of posts in this thread I think the wiki is underutilized here.

QP80 is the +30k conversion (from Nick's work). Same as QP88 and I presume 96.

OC5->NC4-45 QP83
OC6->NC4-75 QP80
OC7->NC5-105 QP91
OC8->NC5-135 QP88
OC9->NC6-165 QP99
OCT3->NC6-195 QP96
OCT5->NC7-315 QP107

The last two are guesses.

​​​​​​​Few data points suggest that upgrades and downgrades are being allowed based on the point values attached to the category designation. Maybe this is by design for implementation after Sept18, maybe a one time only, or maybe something allowed in the system but not supposed to happen. Might be worth attempting to upgrade if that is your aim before that option is closed, if in fact it will be.

QP80 is NC4 with 75K pts versus QP83 with 45K pts. Skimthetrees has special codes for his OC8 to NC5.
I believe there is a set of codes for those OCs that have overpaid 30K, i.e. only apply to OC6, OC8 and Tier1-3 when you convert.

I also agree with zozeppelin's assessment of the situation.

Else the sequence on the "normal" OCs would be as what you listed above in the increment of 8.

I have an OC7 that is now an NC5 by new table. I wonder if I can call and go from an QP91 to a QP99 which would end up being 60k points for a two tier upgrade. Or if I could convince them that since I have an NC5 now that I should go from a QP88 to a QP91 for 30k points. Certainly that would take some acting. But in all seriousness, has anyone had any luck UPGRADING the newly converted TPs?

I was aware of the special cases. I decided to leave the decision about whether or not to add them to the Wiki to others because I wasn't sure if the additional data points would make things clearer or more confusing for those who haven't been following the drama.

Has anyone been able to downgrade their cert more than 1 level? i.e. Cat 9 to Cat 6 for a 90k point refund?