Don't you have a 1099-R form the 401(k) plan administrator that reports that?
If done in 2019, they were required by law to get the 1099-R to you no later the Jan 31, 2019. If you did not receive it, contact the plan administrator for a copy. You cannot file without it.
**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.**
