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see the last update to try...

@OP You are using -vFPAT='\t', which means that the fields are single TAB characters and the fields are separated by anything else.
If I change -vFPAT='\t' to -vFS='\t' then I get:
1@3
...

Dear,
Please try below :

awk -F '[\t]' -v a="0" -v b="10" ' NR>a {if (NF != b ) print NR"@"NF }' test.txt

That's because you are using a regular expression for FS that works differently than you (probably) think it does.
This part:[^,]* matches "0 or more occurrences of a character other than comma"....

The quoting of fields cannot be handled by looking at the separator. All attempts with FS or -F fail.
But replacing a , with a | outside the quotes can be done with another awk
awk...

Hello bmk123,

Welcome to UNIX and Linux forums. Could you please try following and let me know if this helps you.

awk '{print $0,++a[$0]}' OFS="" Input_file
Thanks,
R. Singh