[Duda] ayuda con el video

¿ cuando actualizo la pagina ,mi video ya no esta disponible, es algo que hice mal o el video ya no esta disponible en el canal de Alura ? comparto mi código y la captura de la pagina .

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

.headerPrincipal-nav {
    display: flex;
}

.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: 253px;
    flex-wrap: wrap;
}

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

}

.contenidoPrincipal-cursos-link {
    display: flex;
    width: 23%;
}

.videoSobre .container {
    display: flex;
}
.videoSobre-sobre {
    text-align: center;
    display: flex;
    flex-direction: column;
} 
.videoSobre-video {
    flex-grow: 2;
    flex-shrink: 2;
}
.videoSobre-sobre-list {
    flex-grow: 2;
}



/* responsive */

@media (max-width:768px) {


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

    .headerPrincipal-nav {
        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;
    }
    .videoSobre .container{
        flex-direction: column;
    }

}