Lead Ad Creative Does Not Use External URL
Your lead ad ads are not using an external URL. Lead ads should always link to external content (e.g., an advertiser’s website). It should not link to internal content (e.g., it links to a Facebook page).
To process leads ads in your ad account please updated lead ad URLs for all affected ads on the creative level.
Once you have made these changes you can reprocess any affected ads directly from your Data Connector dashboard 👇
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Error details: Invalid parameter : Lead Ad Creative Does Not Use External URL : Lead Generation Ads should always link to external content (e.g., an advertiser's website), but this ad does not (e.g., it links to a Facebook page). Fix this error by changing the URL at the creative level to point to external content.