I believe that if you made less than $600 and are in the USA you won't get one.
My earnings for 2019 were in the four digits domain, yet I still don't see my 1099 on the site, and I haven't received it by regular mail either.
Not that it matters too much now. I did my taxes long ago, based on PayPal totals and the IRS already took their hefty share from my account