I am not liable in a civil landlord/tenant lawsuit however there is a default judgement how do I proceed?

My ex wife chose to stay in the rental when we separated. I paid the rent up to the end of the month I vacated the property. In the judgement of divorce it states we are liable for all debts and payments related to property we hold. A year and a half later she gets evicted. I was never served, but looked up court records when I learned she was evicted. I was listed as a defendant in the eviction. There is a default judgement against us. I'm in Iowa, she is in Michigan.