This is the reason for the denial, I have 21 years age different from my wife and was approved on the spot. I think when the CO asked me when did I see my wife and I answered last 2 months and how many times we have seen and I said 4 times. I guess that was the end of the interview and he approved me. There is no way couple who are dating(fiancé) can see each other during covid and married couple can’t visit each other. I hope everything is resolved now.