Please see this answer from DanielV01.
The Tax Cuts and Jobs Act eliminated the ability to deduct HELOC and other similar lines of credit interest payments on Schedule A unless the credit is used on the home itself (such as a home improvement). But since you bought a rental property, you may claim this interest against the rental. The Tax Cuts and Jobs Act did not change the deduction when the interest is used for business and can be deducted for the business use.