@macuser_22 is correct.
Since you requested a removal of contributions plus earnings before the 2021 filing due date, your earnings will be subject to the 10% penalty if you are under age 59.5 and your contributions will be treated as never having been contributed.
You will receive a 2021 Form 1099-R next year, however you can report it now instead of waiting for your form next year by following the instructions that @macuser_22 has listed. This other discussion is also a good reference.
Even though you returned the amounts after you found out it was in fact not excess, your earnings will still be taxed since they were withdrawn early (aka your return did not perfectly reverse the removal)
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
