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It probably won't from what you have described, but it's the only other thing I can think of besides waiting for the younger one to age up to YA before coupling them again. If not any of the above, and you have MasterController in play, you might try setting their status back to Best Friends or something (on MC > Sim > Intermediate > Long Term Relationship by Category), then Married again to see if that changes anything.
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Or possibly any other non-NRaas mod that governs romance? Do you have any other mixed age couplings like this in your world that are stable? You aren't using AwesomeMod alongside of NRaas by any chance? Not sure what would happen there, but that one might not be very happy about the sudden mixed-age relationship moving forward. But usually that means a couple can't or refuses to get married (etc.), I've never heard of or seen such a wedding take place and be recognized as a long term relationship bump to spouses yet not really "count" for memories or wish fulfillment as you have described.
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The core level blocks on teen-older romance do get in the way of things at times and sometimes unexpected stuff can happen if the game fights back against the mods' settings. Is this how teen/adult marriages work, or is there a setting in the mods I can try adjusting so they can fulfill the marriage wish and move in together? Thank you! I restarted the game and did a private wedding instead, but I got the same results. They also did not register any memories of exchanging rings and I got the notification that the guests are disappointed to not see a wedding. After the little ceremony scene, they saw each other as husband and wife in their relationship panel, but there was no prompt to move them in together, neither sim changed their last name, and the marriage wishes were not fulfilled. I first tried to throw a wedding party and they were able to use the wedding arch.
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My active sim aged up to young adult, and he got the "Get Married" wish and his parents have the "See so-and-so Get Married" wish, so I decided to have them get married while the inactive sim is still a teenager. I have the settings on Woohooer and SP set to allow teen marriage, pregnancy, teen/adult relationships, etc. They became engaged as teenagers, and I had no problems there. I'm having some trouble with getting a teen/adult couple married.
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