My tag doesn’t working on my WordPress site

I have a wordpress site on my own. i am trying to use in meta refresh tag like this:

 <meta http-equiv="refresh" content="0;URL='tel:+somenumber'" />

but it doesnt work when i inspect my online webpage in head its http-equiv lost like:

<meta content="4; URL='tel:somenumber'"/>

when i try to edit as html and insert again

 <meta http-equiv="refresh" content="0;URL='tel:+somenumber'" />

it works. How can i fix this? I am using Head & Footer Extension for WordPress.

meta http-equiv refresh doesnt working on my wordpress site.