The Lucen Timeline add-in does not load automatically
Symptoms
The Timeline tab is missing from the PowerPoint ribbon whenever PowerPoint is restarted. This occurs despite Timeline being listed on the Active Application Add-ins list (File-> Options-> Add-Ins) in PowerPoint.
Overview
When installed, Timeline attempts to create a series of registry keys with specific values that allow the add-in to operate properly. Sometimes, the LoadBehavior registry keys are not properly set, which restricts Timeline from loading correctly. Accessing RegEdit and restoring the registry key fixes the behavior described above.
Solution
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Press the Windows key on your keyboard to open windows search and type Regedit to open the Registry Editor.
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Navigate to HKEY_CURRENT_USER > Software > Microsoft > > PowerPoint > Add-ins > Timeline > LoadBehavior.

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Double click the “LoadBehavior” key and change the Value data to “3".

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Open PowerPoint and check to see if the Timeline tab is visible.