this bug has been in turbotax for a long time.
here is a work around to accommodate this issue.
I will repeat the context here and some more precise details to fix the Turbotax business 2021 issue with getting error messages for filling out entity data when on form 1065 p1-3 partnership. when you only want to use a partner name instead of an entity.
Go to frorm 1065 p1-3
go to line 29and check the yes box (elect out of centralized paartneship audit regime)
quick zoom to Schedule B-2
fill out schedule B-2 -( names, ssn with dashes, select I for individual . you should see the quantity of individuals appear on 1065 line 29 from B-2 part III line 3
I spent 5 hours to figure out this work around for a turbotax problem that has been around for a long time
PS make sure you have not checked the box "this is not a person" some where else on a form i don't remember
