Hey Isaac
During one of my routine checks, I found that this site - https://doceremedspa.com has no GTM on it. This even though we have 2 of them for this client on our account. We also have a GTM for them on the client's spreadsheet.
In addition, there are no other types of GS or analytics tags at all.
Can you check in on this and find out why?
Here is the screenshot =

Docere no tags.jpg 339 KB • Download

And here is the GTM code on their spreadsheet =

<!-- Google Tag Manager -->
<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-53LVVNZ');</script>
<!-- End Google Tag Manager -->

<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-53LVVNZ"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- End Google Tag Manager (noscript) -->

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Thanks Isaac.