1099 R: Distribution from 401k in 202 (under COVID law)

I received a distribution (and 1099R) from my 401k under the COVID law in 2020.  The law allows me to spread out the distribution over 3 years.  I reported 1/3 for the 2020 tax year. I need to report 1/3 for the 2021 tax year.

However, my 401K administrator did not (and is not) providing me with a 1099R for 2021.  I assume I need to enter in the 1/3 distribution on my own with no back up?  Is this correct?  Thank you.