How to correct 2021 time share rental income already reported to IRS, now reported on 2022 1099
I never received a 2021-1099 for my timeshare rental income but reported it on my 2021 income tax return and offset it with the expenses. Now, I received the 2022-1099 for the timeshare rental income and it reported both the 2021 and 2022 income. Even though it was earned in Dec 2021. It was not paid till Jan 2022. They are saying since I'm not a business, it is not reported when earned but received. How does this have to be corrected. Do I have to submit a revised return and remove the income? Can the expenses be deducted?