The token is a digital key generated whenever you link your LinkedIn account to RD Station Marketing, which uses that token as permission to publish your posts on the social network.
As a security measure, LinkedIn limits the validity of its tokens to 60 days.
With 14 days or fewer remaining until your token expires, RD Station Marketing requests a permission update, as shown in the image below:
RD Station Marketing does allow you to schedule posts for a date following expiry of the digital key. However, if the key is not renewed in time, the scheduled post will not be published.
To update permission, simply click the Reconnect button and the key will be updated for another 60 days.