This LinkedIn-specific error screen means third party cookies are being blocked. There are two possible causes for this: 

• A different extension is blocking third party cookies. DuckDuckGo is a common extension that blocks third party cookies. 
• You have blocked cookies at the browser level. Check your browser settings and make sure Block third-party cookies is NOT checked.

To correct this error, check the following:

1. Open the Extensions settings in your browser window.
2. If you are running an extension that may block third party cookies, shut it off and see if you have any better luck.
3. Otherwise, you may need to shut off all extensions and turn them back on 1 at a time to determine which one is the culprit and is blocking 3rd party cookies.