LinkedIn Page Admin level access to the Company's page is required to pull LinkedIn Social data. Once connected, you will need to select the Company ID for us to pull data from the API.
Note: LinkedIn's API requires users to reconnect once every year for security reasons. This means that you'll just need to go into the LinkedIn credential within Channelmix Control Center, click the edit button next to the credential, and then select "Reconnect".
For more details around reconnecting data sources within ChannelMix Control Center, please read this article.