You should go back and amend your prior year returns.
One of the deductions for a rental property is depreciation, i.e. deducting off the value of your home over time. Your deprecation should start in the year you began using the second home as a rental, otherwise it will not be correct.
If you are amending multiple years, it may be easier to pay an accountant to do it for you.
For help amending using TurboTax see How to amend (change or correct) a return you've already filed
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