It is also affected by your LinkedIn account settings. If you have all your LinkedIn feeds disabled, nothing will come into Daniweb either. In my own Daniweb account, I used to connect to my LinkedIn account. However, I later edited all my LinkedIn Privacy settings to the most private:
(i) I made my Profile visible to nobody except myself,
(ii) I disabled all activity broadcasts,
(iii) I disabled all activity feeds,
I just wanted to become invisible for a while.
So now my Daniweb account doesn't even indicate a LinkedIn icon, even though it is, indeed, posted in my Daniweb account.
Perhaps you have turned off something in LinkedIn that is necessary for Daniweb to link to it?