Assuming I understand you correctly, you rented out your property for 11 months, correct?
If true, then you can prorate your mortgage interest and deduct that amount as a rental expense.
For example, if the mortgage interest on your rental property is $1,200 for the whole year, then you can deduct $1,100 as a rental expense ($1,200 / 12 months = $100 per month x 11 months rented = $1,100). See image below.
If you only rented it for one month, then your mortgage interest rental expense is $100.