Travel approvals shouldn’t be a web of email approvals and per diem tables. In this 12 minute video I create a custom PowerApps form on a SharePoint list for travel approvals. This video incorporates PowerApps with SharePoint integration, Office 365 Users (find manager), Excel lookups from OneDrive, and Flow approvals (including capturing the final approver when a flow approval is reassigned). I start with the SharePoint list already created, but if you're new to SharePoint I show how the list was created at the very end of the video.
More information on claims identities is here: https://social.technet.microsoft.com/wiki/contents/articles/13921.sharepoint-20102013-claims-encoding.aspx
