Metatag tab not showing up on node edit forms

Well, first off you don't need to "enable" it through the admin/config/search/metatags pages, it's automatically show for all supported entities (nodes, terms, users) out of the box.

Does it show for user 1 on your site? If so, did you enable the "advanced permissions" option on the advanced settings page?

Out of interest, are you either using Panopoly, or some custom made node-edit pages built with Panels, Display Suite or something else?

Ok, then it seems something is messing up your site. What modules are do you have enabled?

And what admin theme are you using?

Was that one content type disabled in the "Master control for all entities" section of the advanced settings page?

I am facing the same problem... Did you find a solution to this yet?

@Domsware: Either time to replicate & fix it, or someone to debug the problem, identify the code causing the issue and provide a patch to fix it that doesn't cause other regressions.

I think I also have this problem with latest 8.x version..

The common thing we do have here is the bilingual web site set up.. could that be a cause?
I don't have any Panel, Ponopoly, Display Suite.. sort of that thing installed.

D8 is completely different to D7 in this regard. In D8 you have to specifically add the field to the entity bundle (e.g. content type) in order to see the fields on an edit form. In D7 there are settings that control which entity bundles they show on.

Same problem here with Drupal 8.1.9 and Metatag 8.x-1.0-beta10+8-dev : metas tab are not showing up in node edit forms.

@fab4real: Did you add the "metatag" field to the content types you want to them to show on?

I'm working on a site that, for now, must stay on metatag 7.x-1.4 and ran into this issue. Maybe it will help someone - this is what I did...

In hook_entity_info_alter:

  $entity_info['your_entity_type']['metatags'] = TRUE;
  array_walk($entity_info['your_entity_type']['bundles'], function (&$bundle) {
    $bundle['metatags'] = TRUE;
  });

In hook_form_alter:

  if (strpos($form_id, 'your-entity-type_edit_form') !== FALSE) {
    // This _should_not_ be necessary with up-to-date metatags
    // Either way, it's not going to hurt anything since metatag just overwrites it anyway.
    $form['#metatags'] = [];
  }

And the final piece for me which I had to track down to metatag_entity_has_metatags() - apparently you also have to create a configuration for it admin/config/search/metatags/config/add. It's fine if you just leave it as-is and save. Once I did this the metatags tab showed on the entity edit form.

@chrisrockwell: I'd love to hear why your site "must" stay on v1.4? There have been a *wealth* of fixes since that release.

@DamienMcKenna short answer: All I know is they aren't going to do it now; I've offered my help to get it done. It's a site with > 89000 nodes with metatags on (> 180,000 nodes total)

I was brought on to build a module that could be contributed back. Then I had to integrate it with the existing site, which is using 7.x-1.4 so the code in my comment is in a custom module specifically for this site.

This problem should not exist in the current 7.x-1.x codebase, closing it.

If someone is still experiencing a problem with the module, please open a new issue and contact me directly so I can help track down the problem.