Templates in AMP4EMAIL are more constrained. You can have a dynamic href but the entire attribute value must be replaced:

[dkjonzy2]

Is this still supported? I am trying to dynamically set the URL using amp-bind based on form input values but the AMP validator gives the error message: The relative URL '{{myState.url}}' for attribute 'href' in tag 'a' is disallowed.

Templates in AMP4EMAIL are more constrained. You can have a dynamic href but the entire attribute value must be replaced:

<amp-list ...>
  <template ...>
    <a href="https://example.com/{{id}}"></a>  <!-- not supported -->
    <a href="{{url}}"></a>  <!-- supported -->
  </template>
</amp-list>

Hope that helps!

Originally posted by @dreamofabear in #19741 (comment)