As indicated in the posts above, you can simply print your Form 1040-X (Rev. July 2021) with zero-dollar entries, and include an explanation in Part III. Attach Form 8606 to your amended tax return.
The office you’ll send this to is based on your geographic location. Please see Where To File in the Instructions for Form 1040-X (Rev. September 2021).
Also note that, according to Penalty for Not Filing in the 2021 Instructions for Form 8606:
If you are required to file Form 8606 to report a nondeductible contribution to a traditional IRA for 2021, but don’t do so, you must pay a $50 penalty, unless you can show reasonable cause.
