Hi @PeggyLang ,
Is your people picker a single or multi person picker?
If single, there isnt any formatting required. When you click on dynamic content like you already have done, there should be the option to select Next Assignee, Next Assignee Claims, Next Assignee Display Name, Next Assignee Email etc. Simply just select Next Asignee Email. I am on my mobile right now so the screenshot below is compressed but it should illustrate my point.

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