In 2020 Marriott offered 1,500 points to some members to sign up to its partnership program with Emirates. According to a thread on Flyertalk the offer is coming back.

@flyme2 received an email from Marriott:

Earn 2,000 bonus points1 with Your World Rewards™. Simply join by 31 July and complete a stay by 31 August to earn your exclusive bonus. Plus, you’ll earn twice on stays and flights with this exclusive partnership from Marriott Bonvoy® and Emirates Skywards®.

Bonus is slightly higher, however this time you must complete a stay to earn it.

You World Rewards allows elite members from Marriott and Emirates to receive reciprocal benefits when travelling. Marriott elites are entitled to priority check-in and priority boarding when flying Emirates, and also earn Marriott points for the flight ticket.

Note that you must have received an invitation by email to participate. Otherwise I suggest you not link the account until you receive an invitation or travel with Emirates.