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You need to specify the field separator before you start reading the first line, not during..
e.g.
awk -F, '{print $1; exit}' infile
awk '{print $1; exit}' FS=, infile
awk -v FS=, '{print $1;...

How about this ?
gawk -F"," 'NR == 1 {print $1}' inputfile

You are setting the FS variable inside an action statement when awk/gawk has already read in the first line and decided on the fields based on the current value of FS (which was none). Hence, $1 will...