Claiming 住宅ローン控除 mortgage deduction tax benefit on year end tax adjustment.

I bought a brand new house in Tokyo in December of last year and was looking to claim a the 住宅ローン控除 tax deduction. I was told by the realtor that I just needed to register moving into city hall at the end of 2023. I did this but now I am checking and it looks like I needed to file a tax return at the beginning of this year in order to qualify?

I assumed I would get the deduction in my year end tax adjustment. What actions do I need to take in order to get the benefit this year?
I am a 正社員 currently working in Tokyo and my company does my tax returns.