Will I be able to collect a portion of my ex-spouse's pension benefits?

Question Details: We were divorced 23 years ago. In the property settlement agreement, the transcript says that "both parties have waived their interests in future assets". I was young at the time of my divorce and did not think about my ex-husband's pension benefits at that time. My attorney forgot to mention in the settlement agreement about me being entitled to my ex-husband's pension plan when he retires. I cannot prove anything to the contrary Now my ex has retired from the NY Transit Authority and is collecting a pension. I drafted a Domestic Relations Order that was consented in form by the plan administrator. They need a NY State-registered DRO to process it. What should I do to receive a portion of my ex-husband's pension benefit? Also, although, the divorce was finalized in NJ, I have been a NY resident for the last 15 years. Do I have to register my divorce case in NY first before I can register this DRO with the court? Finally, do I have any grounds to claim a portion of my ex-spouse's pension?

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