Property management company does not provide previous tenant's social security number

[Oleg Serdyuk]

A property management company is managing my investment property. The tenant left, owing a significant amount of money. As a result, I am not planning to continue working with that property management company. Now, I am working with a collection agency to recover the unpaid rent. However, the collection agency is requesting the rental application with the tenant's Social Security Number (SSN), but the property management company is refusing to provide it, citing the sensitive nature of the information. 

How can I proceed? 

Do they have the right to withhold this information even though the tenant owes me money?