IGNORECASE in file comparison with awk - awk

Question

Here is my code:
'FNR==NR {a[$1 FS $2 FS $3 FS $4]++; next} !a[$1 FS $2 FS $3 FS $5]' comparegam.txt workstudyusers1.csv >noidea6.txt
it is doing exactly what I need except I need to ignorecase. I have tried using IGNORECASE=1 in various places but I cant get it to work. it either fails, gives me zero results, or ignores it all together. I tried using BEGIN [IGNORECASE = 1} with no luck.
any help would be appreciated, I am at a lost. I am running this in a terminal window, not from a bash script yet. that is the end goal
Note: Output has to contain case to match original files
Here is the exact code that I have tried with IGNORECASE:
awk -F, 'IGNORECASE=1 FNR==NR {a[$1 FS $2 FS $3 FS $4]++; next} !a[$1 FS $2 FS $3 FS $5]' comparegam.txt workstudyusers1.csv >noidea6.txt
awk -F, 'FNR==NR {IGNORECASE=1} {a[$1 FS $2 FS $3 FS $4]++; next} !a[$1 FS $2 FS $3 FS $5]' comparegam.txt workstudyusers1.csv >noidea6.txt
awk -F, '{IGNORECASE = 1} FNR==NR {a[$1 FS $2 FS $3 FS $4]++; next} !a[$1 FS $2 FS $3 FS $5]' comparegam.txt workstudyusers1.csv >noidea6.txt
awk -F, 'BEGIN {IGNORECASE = 1} FNR==NR {a[$1 FS $2 FS $3 FS $4]++; next} !a[$1 FS $2 FS $3 FS $5]' comparegam.txt workstudyusers1.csv >noidea6.txt
awk -F, 'FNR==NR {{IGNORECASE=1} a[$1 FS $2 FS $3 FS $4]++; next} !a[$1 FS $2 FS $3 FS $5]' comparegam.txt workstudyusers1.csv >noidea6.txt
and various iterations of these.

Answer 1

'
FNR==NR {
a[tolower($1 FS $2 FS $3 FS $4)]++;
next
}
!a[tolower($1 FS $2 FS $3 FS $5)]
' comparegam.txt workstudyusers1.csv >noidea6.txt