Hello Henry,

Can you check again using below instructions:

Twitter Autoposting
1. Edit your Twitter application.
2. Check website URL, Calback URL make sure they are the same as your site domain (http://www.yoursite.com and http://yoursite.com make a big difference)
3. Check if the Access level is Read and Write
4. Check if "Allow this application to be used to Sign in with Twitter" is ticked under Settings
5. Reset the keys then refresh the page
6. Generate a new access token
7. Go to the EasyBlog -> Autoposting -> Advanced Settings page and revoke the access.
8. Go though the EasyBlog -> Autoposting -> Step by step guide and re-enter the new keys and reauthenticate the Twitter access.

If this instructions do not solve your issue, perhaps can you provide us with your backend access and your twitter account so that we are able to assist you on this issue. Please be advise.
Thanks.