I'm trying to show sizes available for unique products in one cell. I currently have the following, however, it is returning FALSE in the cells that should be blank.
Returned value: XS,FALSE,FALSE,L,FALSE,FALSE,3XL,FALSE Expected value: XS,L,3XL
=ARRAYFORMULA(TEXTJOIN(",",TRUE,IF($B$2:$B$15>0,IF($A$2:$A$15=A2,$C$2:$C$15,""))))