LinkedIn Token Expired Error when setting up channel

I'm using JFBConnect purely as a Twitter/LinkedIn stream at this point in time. I'm not using an Facebook connections.

I've got Twitter working, but I've having problems with LinkedIn.

Site is on a dev domain so I've setup an app profile specifically for dev in both twitter & linked in developer sites (I'll switch over to live once it the site goes live).

I've logged in with a user in the front end and used index.php?option=com_jfbconnect&view=account to connect to both Twitter & LinkedIn.

I get the follow error on page the channel edit with the LinkedIn channel open: (administrator/index.php?option=com_jfbconnect&view=channel&layout=edit&id=3)

"This user's access token has expired. Please have them re-authenticate on the front-end of the site."

The users shows as: "LinkedIn Linked Login with LinkedIn to view profile Unlink"

I've tried repeatedly unlinking / relinking LinkedIn but it's not made any difference so far.

(note {site} has the actual site url)

On linked in I have r_basicprofile ticked
The callback URL http://{site}/index.php?option=com_jfbconnect&task=authenticate.callback&provider=linkedin
JavaScript http://{site}/

I'm seeing the usage on get my profile, oauth2 app authorization code request & oauth2 app access tocket request.

Is there anything else I can try?

Thanks!

Thank you very much! That did the trick, I was using Joomla credentials to login to the front end, then authorise LinkedIn.