Why is coupon code EARLY_BIRDpp7y0g4_200_DOLLARS not working ?

Last year I purchased coupon code EARLY_BIRDpp7y0g4_200_DOLLARS

When trying to apply it last week, and again today (last day I can use it) it doesn’t seem to decrease &650 to $450.

Please advise what I can do to get this coupon to work.

Thanks,

L. Spall