Add tag

Good day,
please I need some explication about adding an html href tag .
I modyfied this portion of code in this way:

array(
‘id’ => ‘top-left-phone’,
‘type’ => ‘textarea’,
‘title’ => __( ‘Phone’, ‘yachtcharter’ ),
‘subtitle’ => __( ”, ‘yachtcharter’ ),
‘desc’ => __( ‘e.g. 1800-1111-2222’, ‘yachtcharter’ ),
‘default’ => ‘1800-1111-2222’,
‘validate’ => ‘html_custom’,
‘allowed_html’ => array(
‘a’ => array(
‘href’ => array(),
‘title’ => array()
),
‘br’ => array(),
’em’ => array(),
‘strong’ => array()
)
),

in order to insert html for tel calls in a topbar.
always it prints

+393351111111
escaping the html tag..

how can I fix?

many tks in advance for your help.
Dario