Addendum:

In my case the URL triggering the Error 
`https://<your_site_url>/mailman3/accounts/fedora/login/?process=login&amp;next=%2Fmailman3%2Faccounts%2Fsignup%2F`
  is returned by:

- 
`https://<your_site_url>/mailman3/accounts/signup/?next=%2Fmailman3%2Faccounts%2Fsignup%2F`

```
[...]

<div class="socialaccount_ballot">

  <ul class="socialaccount_providers list-inline">
    
<li class="list-inline-item">
  <a title="Fedora" class="socialaccount_provider fedora btn 
btn-outline-secondary"
     
href="/mailman3/accounts/fedora/login/?process=login&amp;next=%2Fmailman3%2Faccounts%2Fsignup%2F">
    <img alt="" src="/mailman3/static/django-mailman3/img/login/fedora.png" />
    Fedora
  </a>
</li>

  </ul>

  <div class="login-or">or</div>

</div>

[...]

````

cheers,
 Bernie
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