The reason why the email is not sent to the default code set the email to the requester so that, in testing, there will not be spamming to your manager.
You can change it from the ConfirmationScreen.onVisible
Change it with the following code:
//send email with email template
Office365.SendEmail(_selectedApprover.UserPrincipalName, "New Leave Request", First(EmailTemplate).Value, {Importance: "Normal", IsHtml: true});
However, it is not suggested to change the send email template while the app is still in testing process.
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