[Duda] ORDER: -1 (no funciona)

Hola, no sé por qué no me funciona. Adjunto mi código CSS

.headerPrincipal .container{
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.headerPrincipal-nav {
    display: flex;
}

.contenidoPrincipal-cursos{
    display: flex;
    flex-wrap: wrap;
}

.contenidoPrincipal-cursos-link{
    display: flex;
    width: 23%;
}
.rodapePrincipal-patrocinadores .container{
    display: flex;
    justify-content: space-between;
}

.rodapePrincipal-patrocinadores-list{
    display: flex;
    align-items: center;
    justify-content: space-around;
    width: 70%;
    margin-right: 5%;
}

.rodapePrincipal-contatoForm{
    width: 25%;
}

.rodapePrincipal-contatoForm-fieldset{
    display: flex;
}

.rodapePrincipal-navMap-list{
    display: flex;
    flex-direction: column;
    height: 255px;
    flex-wrap: wrap;
}


/* RESPONSIVE */

@media (max-width:768px){

.headerPrincipal .container{
    flex-direction: column;
    align-items: initial;
    text-align: center;
}

.headerPrincipal-nav {
    display: flex;
    flex-direction: column;
}

.contenidoPrincipal-cursos{
    flex-direction: column;
}

.contenidoPrincipal-cursos-link{
    width: 100%;
}

.rodapePrincipal-navMap-list{
    height: auto;
    flex-wrap: nowrap;
}

.rodapePrincipal-patrocinadores .container{
    flex-direction: column;
}

.rodapePrincipal-contatoForm{
    width: 100%;
}

.rodapePrincipal-patrocinadores-list{
    align-items: center;
    width: 100%;
    margin: 0%;
}

.rodapePrincipal-contatoForm-fieldset{
    justify-content: center;
}`

.headerPrincipal-nav-link-app{
    order: -1;
}

}