The final URL in the LinkedIn ad must be a full URL and not shortened by a link shortener (e.g., bit.ly, with the exception of hubs.ly). Link shorteners strip parameters from the end of the URL and prevents tracking.
The URL in the LinkedIn ad cannot redirect because HubSpot's tracking parameters are stripped during redirects. Only use the final, non-redirecting version of a URL. This includes http to https redirects.
LinkedIn automatically shortens long ad URLs. LinkedIn's automatic link shortening is compatible with HubSpot's tracking and will not interfere with HubSpot's ability to apply the tracking template.
It is not possible to track LinkedIn ads that use @mentions or hashtags (#).
Necessary disclosure: your use of the LinkedIn Ads integration is subject to LinkedIn's terms and conditions. HubSpot will be able to view and manage your account, as well as store your LinkedIn Ads account number. When you authorize the integration, HubSpot receives a user token with permissions on the connected ad accounts and pages. HubSpot can view but does store all the ad accounts and pages you have permissions for. LinkedIn will share settings details (e.g., name, budget, bid strategy, creative) and performance metrics (impressions, clicks, etc.) for all campaign groups, campaigns, and ads in the ad accounts you connected.