Unfortunately, LinkedIn prevents automated systems to access their articles pages, this is the reason why we are unable to generate the link preview.
Currently it is only possible to do this natively, directly within LinkedIn.com.
As soon as this changes we will support this accordingly.
The issue is only related to Linkedin Articles, other websites are not affected by this.
Have any questions with regards to this?
No worries, please submit a support ticket with your questions and we'll be happy to help.