History of Confidence Is High

Confidence Is High is a Trials of Osiris triumph and one of the requirements for the Flawless seal (Flawless). It asks you to complete a Flawless Passage of Confidence during the current Season.

How to complete

1. Win seven matches in a row without a loss on a Trials passage to reach the Lighthouse. Only a flawless run with the Passage of Confidence counts.
2. Obtain the Passage of Confidence from the Trials vendor (TheGamer) and play it. Search results indicate it only appears after you have already gone flawless once that week, so expect two back-to-back flawless runs (not confirmed on a page I could open).
3. Win seven in a row again. The passage doubles the Lighthouse chest loot.

Tips: TheGamer notes this is tough for less experienced players, so practice in regular Crucible scrims first and queue with a coordinated fireteam.

Rewards

Triumph score 10. It counts toward the Flawless title; TheGamer lists it alongside Safe Harbor, Guardians of the Lighthouse, This is the Way and All Roads to Victory. GuardianBoost lists a different set of companion triumphs, so the seal list may have changed between seasons.

The triumph says "during the current Season", so it is a seasonal requirement.