Navigate to your company page on Linkedin and select Admin tools, then click Manage admins within the Settings area. You must already be a page admin in order to be able to access these settings.
Once in the Manage admins section, click the Paid media admins toggle
Then select + Add paid media admin and search for your name. Tick the Lead gen forms manager box and hit save. You now have Lead gen forms manager access and will be able to connect your Linkedin page to Driftrock.