Hi @Haz ,
As far as I know, there is no 'Start a task process' in the flow. Instead, you could use "Start and wait for an approval" action in Power Automate/flow. Please refer to this article for more:
https://learn.microsoft.com/en-us/powerapps/maker/canvas-apps/sharepoint-scenario-approval-flow
What's more, you don't have to create tasks in the task list any more. With this action, wou can simply approve/reject the approval through email. Like the below:
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