3.6.3:Error when posting to Facebook closed group recognize them as secret

Please see: https://www.nextscripts.com/updts/news/2015/08/facebook-no-longer-allows-posting-to-secret-groups-if-you-are-not-an-admin/

I know that, but as i said before is closed groups and your plugin recognize them as secret groups…

It’s not a plugin that returns that error. It’s Facebook itself.

so now we can’t post even on closed groups?

is fb bug or new fb rule?

It looks like Facebook removed an ability to post to closed groups for non-admins as well.

As usual, they did it silently.

Now i got this msg for closed groups:

Array ( [Warning] => [Error] => (#200) The user has not authorized the application to perform this action. )

Btw do you update the fb api code to 2.6?

Yes, this is the exactly error Facebook is throwing to any attempts to post to closed groups as non-admin.

Btw do you update the fb api code to 2.6?

There are no changes in API 2.6 related to posting.

Ok. Would it be a good idea for you to make a complaint ticket on facebook and notify all the clients about it so we can go and support that complaint?

As I said before, the app I have created uses the version 2.4. API Upgrade Tool tells me that I have to upgrade on 5 items.
Items to fix to upgrade xx from v2.4 to v2.6:
1.
Version: 9 October 2017 v2.5
Call Volume: 81.5 % / 32.4K
Effected Methods: GET {post-id}/comments 32.4K
Description: The ‘place’ field of the Post node now returns a consistent Place node. Previously it could be a Page, Event, or other object. If there is any Event data, it is now found on the ‘event’ field.
Type: Change
2.
Version: 9 October 2017 v2.5
Call Volume: 81.5 % / 32.4K
Effected Methods: GET {post-id}/comments 32.4K
Description: The ‘message_tags’, ‘name_tags’, and ‘description_tags’ fields, exposed on various objects, will now always be returned as a list, where they were previously returned as a list in some cases and map in others.
Type: Change
3.
Version: 12 April 2018 v2.6
Call Volume: 21.5 % / 8.5K
Effected Methods: GET {page-name-id}7.4K / GET {post-id}/comments / 1.2K
Description: The ‘likes’ field on the Page node has been renamed to ‘fan_count’.
Type: Change
4.
Version: 12 April 2018 v2.6
Call Volume: 2.9 % / 1.2K
Effected Methods: GET {post-id}/comments1.2K
Description: Removes the address field on the User node.
Type: Deprecation
5.
Version: 12 April 2018 v2.6
Call Volume: 1.9 % / 737.0
Effected Methods: GET {post-id}/comments 737.0
Description: GET {user_id}/accounts no longer requires manage_pages. Instead, you can request pages_show_list, a new permission. Both permissions will work for this endpoint from v2.5
Type: New
How can I upgrade those things?