Dear community,
I am in the process of trying to create a flow which serves the following objectives:
1) Create a form for members of an organization to fill up (successfully created)
2) When response is received, automate a flow that requires first level approver to approve it (problem faced)
3) After 1st approver completes approvals, send an email notification to update and prompt final approver to approve the form.
4) After final approver approves it, an email notification is sent to starter, both approvers and an administration team.
Flow process:
1) Form response submitted - successful
2) Form response ID found - successful
3) Get user profile - successful
4) Create an approval - failed
Error:
BadRequestThe request failed. Error code: 'InvalidApprovalRequestor'. Error Message: 'The approval requestor must be a single, valid user account within your organization.'. Screenshot:

Situation: The user is within the same organization, however, the selection of the line manager's email is by a means of a text fill submitted by the requestor.
screenshot of the form below

screenshot of the Power Automate screen

How do i go forward with this? I will like the responder to be able to manually input for the line manager's email