Did you just update to Mojave?
LinkedIn Integration with OS X Mojave – No Longer Available
We're retiring LinkedIn’s existing system integration in Apple’s MacOS Mojave, which will ship to existing Apple Mac users on September 24, 2018.
Important: If you choose not to upgrade your OS to Mojave, the LinkedIn features will continue to work as normal.
Once you upgrade your Mac OS system, the following LinkedIn features will no longer be available:
- Adding or syncing your LinkedIn Connections to Apple OS X contacts.
- Sharing LinkedIn updates from Safari and Notification Center.
- Viewing LinkedIn notifications in Mac OS X Desktop.
Note: You won’t lose your existing contacts that you’ve already synced from LinkedIn. You can also continue to post or share LinkedIn updates from LinkedIn.com via any browser.
Here are some possible workarounds to help replace the retired functionality:
Check out how to download the LinkedIn mobile app.
https://www.linkedin.com/help/linkedin/answer/46321/linkedin-integration-with-os-x-mojave-no-longer-available?lang=en
https://www.linkedin.com/help/linkedin/answer/4135/supported-internet-browsers-for-linkedin?lang=en