We just got confirmation from our Apollo rep that they changed their extension:
Apollo changed the extension experience to align with LinkedIn compliance standards. To clarify, this is a LinkedIn policy change also affecting our competitors, not a specific Apollo limitation. As you mentioned, the previous bulk prospecting flow is unavailable. The current path requires using Suggested Leads from the Sales Navigator search and then continuing from the individual's standard LinkedIn profile, but I recognize this isn't equivalent for your outbound volume.