Agree, favicon not found.
Did you check your theme using this :
https://wpastra.com/docs/favicon-site-icon/
Done! I added, Thanks. any idea regarding Google tag manager?
How have you initally implemented the tag manager ?
The googletagmanager.com/gtm.js script calls this ID :
GTM-KQF7L89
but it is not valid :
<!-- Google Tag Manager added by Site Kit -->
<script>( function( w, d, s, l, i ) {
w[l] = w[l] || [];
w[l].push( {'gtm.start': new Date().getTime(), event: 'gtm.js'} );
var f = d.getElementsByTagName( s )[0],
j = d.createElement( s ), dl = l != 'dataLayer' ? '&l=' + l : '';
j.async = true;
j.src = 'https://www.googletagmanager.com/gtm.js?id=' + i + dl;
f.parentNode.insertBefore( j, f );
} )( window, document, 'script', 'dataLayer', 'GTM-KQF7L89' );
</script>
<!-- End Google Tag Manager -->
I did it using Site Kit. Now I just disconnected that! thanks @corrinarusso
That would be all.