Originally Posted by
DCAproducer
I had issues with this promo as well.
I eventually received a 'Your Registration is Successful!' email. Will report back here if/when points/miles post.
Originally Posted by
tfung
I've had issues with even linking my SQ account to Marriott.. Every time I try to link the 2, it shows my account as "Not Linked". When it try to register after, I get an error message saying my registration is unsuccessful.. No amount of talking to SQ online chat can resolve this.. I just ended up giving up.. I just sent an email to krisflyer to see if they can do anything...
Bummer. The combined forces of Marriott and SQ IT hard at work

If you haven't done so, maybe check your KrisFlyer profile under the "Partner programmes" tab to see if it's a false negative. That's what I did to confirm my KF and Marriott Bonvoy accounts were indeed still linked and, by extension, should be eligible for the dual earn promo registration.
Hope your email to KF gets some results!