LinkedIn Authentication is throwing error

LinkedIn login was working fine until a few days back and in the recent past, it has been giving an error message as "The redirect_uri does not match the registered value" for LinkedIn.

When we debugged the source, we observed that the function auth() from controller.php is returning the error message as given above when the url given below is triggered. We believe that the error is at the first level authentication from api.slogin.info.

www.linkedin.com/oauth/v2/authorization?...ofile+r_emailaddress

Please check and do the needful to fix the issue.

Hello. Unfortunately, LinkedIn is blocked in our country and we cannot test this social network.