Try settings DefaultSelectedItems property of manager data card to:
If(!IsBlank(DataCardValue6.Selected.Email), { '@odata.type': "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedUser", Claims: "i:0#.f|membership|" & Office365Users.ManagerV2(DataCardValue6.Selected.Email).mail, DisplayName: Office365Users.ManagerV2(DataCardValue6.Selected.Email).displayName, Email: Office365Users.ManagerV2(DataCardValue6.Selected.Email).mail, JobTitle: "", Department: "", Picture: "" });
OR simply:
If(!IsBlank(DataCardValue6.Selected.Email), { '@odata.type': "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedUser", Claims: "i:0#.f|membership|" & Office365Users.ManagerV2(DataCardValue6.Selected.Email).mail, DisplayName: Office365Users.ManagerV2(DataCardValue6.Selected.Email).displayName, Email: Office365Users.ManagerV2(DataCardValue6.Selected.Email).mail });
References:
- How to auto-populate the Manager Details based on the person field
- Auto-populate person look-up as the manager of a nominated person (not current user)