LinkedIn requires that you re-authenticate your account in third party social schedulers every 60 days. Lately will notify you via email one week prior to your LinkedIn expiration as a "heads up" and will include instructions on how to reconnect your LinkedIn account in Lately. Lately will also give you a reminder within your dashboard in your Channels & Messaging library. Any LinkedIn account that needs to be reconnected will say "Need to reauth" next to the account name. You can hover over "Need to reauth" for further information and instructions to reconnect.
To reconnect your LinkedIn account in Lately, go to Setup --> Channels & Messaging. Select “Connect Channel" and click "LinkedIn”. We’ll automatically update the token for any channels you’ve already connected, and ask if you want to connect any others.