https://nishantrana.me/2021/11/03/fixed-invalidapprovalcreaterequestassignedtonovalidusers-error-message-required-field-assignedto-contained-no-valid-users-in-the-organization/
Fixed - 'InvalidApprovalCreateRequestAssignedToNoValidUsers'. Error Message: 'Required field 'assignedTo' contained no valid users in the organization'.