Partial works on index, can't seem to reuse in single.html?

I’ve created a partial with the html for an email signup form and want to use it in a few places

In my <THEME>/layouts/index.html

I’m using
{{ partial “mailchimp.html” .}}
{{ end }}

and seeing my signup form on the front page

I also want to put the form at the bottom of my docs page /layouts/docs/single.html
But if I use the same text
{{ partial “mailchimp.html” .}}
{{ end }}

I get an errorUnexpected {{end}}

the footer partial in <THEME>/layouts/docs/single.html
is called like this:
{{ define “footer” }}
{{ partial “footer.html” . }}
{{ end }}

If I try to call the mailchimp partial the same way

{{ define "mailchimp" }} 
  {{ partial "mailchimp.html" . }} 
{{ end }}

No extra text appears in my page but I don’t get any errors in the console

my <THEME>/layouts/partials/mailchimp.html

<!--add email form -->
  <div class = "form-subscribe">
  <form method="post" action="" class="form">
    <div class="form-item">
        <!-- <label>Label</label> -->
        <div class="append">
            <input type="text" name="search" placeholder="">
            <button class="button outline">Subcribe for Free</button>
<br />
<a href="/blog/" style="color:grey">No, thanks just show me the content please</a>
  <!-- end email form-->

My /layouts/partials/footer.html displays fine.

There are no variable in mailchimp.html to be parsed, just html. Am I missing something really simple here?

Drop the {{end}}. You “got lucky” on the index (you have something else wrong in that template).