Quick question about High-end Duties

Hello everyone :o I was wondering if I should finish every expansions before doing High-end content or not. And how do you unlock "High-end Duty" in Party Finder? Because even though I've completed some it's still greyed out.

The High-end Duty section has the most recent Extreme Trials and Savage Raids. Also all the Ultimates.

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Originally Posted by CaptainLagbeard

The High-end Duty section has the most recent Extreme Trials and Savage Raids. Also all the Ultimates.

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Thank you for the info!