Coupon not working

When I tried to apply the SPRING20 coupon at checkout, it said it was not applicable to the item in my cart, despite the fact that it was not on the excluded list.
Knightess Firmus Aurum, Maid of the Mitten, Slayer of Dissertation Dragons in the Order of the Curly Crusaders
2b/medium; CG 5/20/09
Wash, co-wash, co: Queen Helene Royal Curl Shampoo / Conditioner, Kiehl's Amino Acid Shampoo / Conditioner, Redken Fresh Curls Shampoo, CJ Daily Fix, Tigi MM
Stylers: Sally's Neutral Protein Filler as spray, Queen Helene Royal Curl Creme, LALSG
Techniques: Plop and Diffuse
Hair bio: http://www.naturallycurly.com/curltalk/showpost.php?p=1368664&postcount=97
2b/medium; CG 5/20/09
Wash, co-wash, co: Queen Helene Royal Curl Shampoo / Conditioner, Kiehl's Amino Acid Shampoo / Conditioner, Redken Fresh Curls Shampoo, CJ Daily Fix, Tigi MM
Stylers: Sally's Neutral Protein Filler as spray, Queen Helene Royal Curl Creme, LALSG
Techniques: Plop and Diffuse
Hair bio: http://www.naturallycurly.com/curltalk/showpost.php?p=1368664&postcount=97
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2b/medium; CG 5/20/09
Wash, co-wash, co: Queen Helene Royal Curl Shampoo / Conditioner, Kiehl's Amino Acid Shampoo / Conditioner, Redken Fresh Curls Shampoo, CJ Daily Fix, Tigi MM
Stylers: Sally's Neutral Protein Filler as spray, Queen Helene Royal Curl Creme, LALSG
Techniques: Plop and Diffuse
Hair bio: http://www.naturallycurly.com/curltalk/showpost.php?p=1368664&postcount=97
2b/medium; CG 5/20/09
Wash, co-wash, co: Queen Helene Royal Curl Shampoo / Conditioner, Kiehl's Amino Acid Shampoo / Conditioner, Redken Fresh Curls Shampoo, CJ Daily Fix, Tigi MM
Stylers: Sally's Neutral Protein Filler as spray, Queen Helene Royal Curl Creme, LALSG
Techniques: Plop and Diffuse
Hair bio: http://www.naturallycurly.com/curltalk/showpost.php?p=1368664&postcount=97