file by mail using a tracking service if the original was not in fact yours. Be aware that if you are a victim of identity theft, a report on the iRS handling of these says that on average 650 days. Meanwhile refund of the second filer is held up.
https://www.irs.gov/individuals/how-irs-id-theft-victim-assistance-works#:~:text=You%20will%20receiv...
