I can help you void your rejected 1099 in your QuickBooks Online (QBO).
Rejection of 1099s in QBO usually happens because the legal name, EIN, or SSN of the company and contractor's address don't match with IRS records. You can follow these steps to resolve this:
In your QBO account, go to Taxes.
Select 1099 filings.
Select Void forms. This will void all forms that have been rejected.
Go to the Contractors tab.
Select Prepare 1099s.
Choose Edit ✎ to see more info or to make the necessary corrections.
To help you in the task of reviewing contractors' info, you can run the Vendor Contact List report.
After you've updated your 1099s with the correct info, click on Prepare 1099s.
Follow the onscreen steps to e-file your 1099s again.
Once complete, each contractor will be mailed a new paper and electronic copy of their 1099 form.