ractual context, it is well settled that unjust enrichment damages are unavailable when a claim rests on the breach of an express contract. Shaw v. Hyatt Int'l Corp., 461 F.3d 899, 902 (7th Cir. 2006) (citation omitted); see also Mitsubishi Int'l Corp. v. Cardinal Textile Sales, 14 F.3d 1507, 1518 (11th Cir. 19