Basically, go to the LinkedIn developer area and see if there are any settings to "Upgrade" or "Use Member Permissions". If so, check the box and hit save.To opt-in your API key, click the Use Member Permissions checkbox in your Application Details page. Once you submit the form, it can take up to 15 minutes for this change to go live. Remember: You can opt-in anytime, but you can never leave.
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