redirect_to paramater

I added the redirect_to parameter to the switch URL as described in the FAQ, but it doesn’t work.
Whether I include the parameter or not, it redirects to home_url() or admin_url(). Are there any other required parameters or settings?

if ( method_exists( 'user_switching', 'maybe_switch_url' ) ) {
    $url = user_switching::maybe_switch_url( $target_user );
    $my_page = 'slug_of_target_page';
    if ( $url ) {
        // Redirect to the home page after switching:
        $redirect_to = home_url( '/' ) . $my_page;
        printf(
            '<a href="%1$s">Switch to %2$s</a>',
            esc_url( add_query_arg(
                'redirect_to',
                rawurlencode( $redirect_to ),
                $url
            ) ),
            esc_html( $target_user->display_name )
        );
    }
}