Connect OAuth doesn't work

[kenjibailly]

For Twitter I get this error:

Can't request OAuth: Response body is incorrect. Can't extract token and secret from this: '<?xml version='1.0' encoding='UTF-8'?><errors><error code="415">Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings</error></errors>'

(fixed it by manually giving in the code)

For Facebook:
When logged in it goes to a blank page:

When logged out it shows this:

I checked in my app and added the domain of oposter to my facebook app, but didn't change anything.

I tried to find the page id and access token manually, but when trying to send a test I get this error:

Can't send due to the following exception: Received Facebook error response of type OAuthException: (#200) If posting to a group, requires app being installed in the group, and \ either publish_to_groups permission with user token, or both pages_read_engagement \ and pages_manage_posts permission with page token; If posting to a page, \ requires both pages_read_engagement and pages_manage_posts as an admin with \ sufficient administrative permission (code 200, subcode null) 'null - null'

I'm guessing I found the wrong id and access token, still trying to figure out the manual part.
Edit: I have requested advanced permissions with those above in the error.