table.wc-orders-list-table tr.activation_error {
    position: relative;
    background: #ffdede;
}

table.wc-orders-list-table tr.activation_error td:last-child::after {
    position: absolute;
    content: 'Activation error';
    background: red;
    font-size: 10px;
    color: #fff;
    padding: 0 5px;
    top: 0;
    right: 0;
}