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Converts a LinkedIn profile or company URL to a URN for @mentions in posts. How to use LinkedIn @mentions (2-step workflow): 1. Call this endpoint with the LinkedIn profile/company URL to get the mention URN and format. 2. Embed the returned mentionFormat (e.g. @[Vincent Jong](urn:li:person:xxx)) directly in your post's content field. Example: - Resolve: GET /v1/accounts/{id}/linkedin-mentions?url=linkedin.com/in/vincentjong&displayName=Vincent Jong - Returns: mentionFormat: "@[Vincent Jong](urn:li:person:xxx)" - Use in post content: "Great talk with @[Vincent Jong](urn:li:person:xxx) today!" Important: The mentions array field in POST /v1/posts is stored for reference only and does NOT trigger @mentions on LinkedIn. You must embed the mention format directly in the content text. Requirements: - Person mentions require the LinkedIn account to be admin of at least one organization. This is a LinkedIn API limitation: the only endpoints that resolve profile URLs to member URNs (vanityUrl, peopleTypeahead) are scoped to organization followers. There is no public LinkedIn API to resolve a vanity URL without organization context. - Organization mentions (e.g. @Microsoft) work without this requirement. - For person mentions to be clickable, the displayName parameter must exactly match the name shown on their LinkedIn profile. - Person mentions DO work when published from personal profiles (the URN just needs to be valid). The limitation is only in the resolution step (URL to URN), not in publishing.