Using Start Date and Due Date in Timeline View

Hello, I'm trying to use Timeline view, but am wondering what I'm missing here.

I have a Start Date field and a Due Date field, but in the Timeline View By: field in the Toolbar, I can select Due Date, which gives me a dot rather than a timeline. If I select Start Date, it gives me the option of selecting a secondary date field (+Add End date), but only allows me to select First Created and Last Updated as options, Due Date is MIA.

Thanks for any thoughts.

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