Please follow the next steps in order to find the ID:
1) As a company page administrator, your Company ID can be retrieved by navigating to the admin section of your company page. For example, the LinkedIn Company Admin Page is https://www.linkedin.com/company/1337/admin/. The Company ID is 1337 in our example.
2) Copy the ID and paste it in the "Company or Showcase Page ID" field.
3) Save changes.
This article related to BestWebSoft’s LinkedIn plugin
Additional resources: BestWebSoft’s LinkedIn - User Guide
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