For EFA, is there a syntax to compute factor scores when missing data?

#1
I know there is a way to compute a sum when data are missing (e.g., I have 8 variables I want to sum and I'm okay if 2 are missing so I would use sum.6(var1, var2, var3,...).

Is there also a way to compute factor scores when I have missing data? Is there any reason why I should NOT compute a factor score when there is missing data (e.g., I only have 5 variables in a factor and so should not compute a score if missing data)?

Thanks in advance!