As long your wife LULUS, everything is fine. Wait till end of month to get money.

Your wife can register new BPN account through here, so you guys can check whether personal info, bank detail is correct or not, and creating BPN account, you can see how much you can get from BPN.

When you register BPN account for her, have you go through this?

I noticed that. Unfortunately, your wife BR1M account, every old detail is still remain, hence you guys can get only RM500, because your wife account has old detail and single in that time.
BR1M / BSH / BPN, personal and bank detail cannot edit or update online. You need prepare your marriage JPN certs, go to KWSP and revise / update information at there as soon as possible.
KWSP office supposed to open on 15 April, but I afraid PKP / MCO could be extend again, and BPN registration deadline on 30 April and payment on 30 April & 31 May.

15 April KWSP will be very crowd... better don't go though...

yes when i set up for my father.
now my Mother and Father both become bujang and Lulus for individual.

i apply for my father first but fail with above error.
than i change my father status to bujang and it work.
check my mother IC, she is single and qualify for rm 800.