How can I ensure in Clay if LinkedIn profile is valid or invalid

We don't have a specific feature to directly validate LinkedIn profiles. However, you can use our "Verify if a person still works at a company" template to check if a LinkedIn profile is current. Alternatively, you can use the "Find Work Email From Profile Url with Findymail" action. This action uses LinkedIn profile URLs to find work email addresses, which can indirectly indicate if a profile is valid. If you need more detailed verification, you might want to request human assistance for further guidance.

Sources: Verify if a person still works at a company | Clay Find Work Email From Profile Url with Findymail | Clay.com