You can add certifications to your LinkedIn account using this account.
1- Open this URL: https://www.lynda.com/portal/sip?org=spl.org
2- Sign in using the info you purchased.
3- In the Profile settings, edit the name to be your own name so it can appear on your certification later on.
4- After Obtaining a certification, do not share with your LinkedIn account.
5- Sign in using your Linkedin account and add the certification manually, so it can appear in your profile.
There are few rules:
-You can’t merge or link your Lynda account to Linkedin
-You can’t add Lynda email to Linkedin
-Please add your certificate manually on Linkedin