Can’t get vinyl to stick to hard side luggage

I was really hoping to put my daughter’s initials on her new hardside luggage (Quince) but it won’t stick. I cleaned with alcohol first. I’ve made hundreds of items with my Cricut so this is perplexing me. I didn’t have access to Oracle 651 so tried 2 different generic craft store brands. Think it’s the vinyl? Or the luggage?