How can we remove the users IFW license?

Hello Team,
can anyone advise how can i remove the IFW licenses of users? currently, I have successfully removed other licenses and for IFW I am using MQL but even upon successfully running the query (cross-checked in user history) still do not know how but it is getting reassigned again and again. I have listed the command I am using let me know if they are wrong.or any other way to get it done.

cmd- 

mod person username remove product IFW; #removing IFW

print person username select product; #checking if it is still there

print person username select history; #checking history