Notice: PHP’s XML extension is not available.

hello world

i’m getting following notice, every time I visit “Site Health”

Notice: PHP’s XML extension is not available. Please contact your hosting provider to enable PHP’s XML extension. in /pathTo/youarebetter.com/wordpress/wp-content/plugins/jetpack/modules/shortcodes/class.filter-embedded-html-objects.php on line 345

the PHP’ XML extension *is* present though..

$ php -i | egrep '^XML Support'
XML Support => active
$

Please advise)
Thank you!