This is an interesting question. Not surprised that there are no replies as these would be rare events, and the purchaser would also need to be on this forum.
Is this a California property? We know they charge property tax separately to the unit owners. Florida, Arizona and Nevada property taxes are paid by the HOA and charged back in MF, so you wouldn't see an individual unit ever go up for tax sale in those jurisdictions.
I would think it would be as simple as sending your quit claim deed from the county to Marriott Vacation Club's transfer department. MVC has a right of first refusal ("ROFR") on most resorts. I am am not sure how that would work on a statutory sale by the county. My guess is the statutory right of the county to affect the sale would prevail over any contractual ROFR rights belonging to MVC. I am sure MVC would not see as that straightforward.