Getting the Entity does not have a key defined but it actually does.

So I am trying to use EF 6 with the AdventureWorks database to build out some web api services.
Everything was going well until I added the EmployeeDepartmentHistory table and then I keep getting the "The entity "EmployeeDepartmentHistory' does not have a key defined."
But here is my edmx file which does have it defined.
edmx:
<EntityType Name="EmployeeDepartmentHistory">
<Key>
<PropertyRef Name="BusinessEntityID" />
<PropertyRef Name="DepartmentID" />
<PropertyRef Name="ShiftID" />
<PropertyRef Name="StartDate" />
</Key>
<Property Name="BusinessEntityID" Type="int" Nullable="false" />
<Property Name="DepartmentID" Type="smallint" Nullable="false" />
<Property Name="ShiftID" Type="tinyint" Nullable="false" />
<Property Name="StartDate" Type="date" Nullable="false" />
<Property Name="EndDate" Type="date" />
<Property Name="ModifiedDate" Type="datetime" Nullable="false" />
</EntityType>
<EntityType Name="EmployeeDepartmentHistory" Abstract="false">
<Key>
<PropertyRef Name="BusinessEntityID" />
<PropertyRef Name="DepartmentID" />
<PropertyRef Name="ShiftID" />
<PropertyRef Name="StartDate" />
</Key>
<Property Name="BusinessEntityID" Type="Int32" Nullable="false"/>
<Property Name="DepartmentID" Type="Int16" Nullable="false" />
<Property Name="ShiftID" Type="Byte" Nullable="false" />
<Property Name="StartDate" Type="DateTime" Nullable="false" Precision="0" />
<Property Name="EndDate" Type="DateTime" Precision="0" />
<Property Name="ModifiedDate" Type="DateTime" Nullable="false" Precision="3" />
<NavigationProperty Name="Department" Relationship="AdventureWorks2012Model.FK_EmployeeDepartmentHistory_Department_DepartmentID" FromRole="EmployeeDepartmentHistory" ToRole="Department" />
<NavigationProperty Name="Employee" Relationship="AdventureWorks2012Model.FK_EmployeeDepartmentHistory_Employee_BusinessEntityID" FromRole="EmployeeDepartmentHistory" ToRole="Employee" />
<NavigationProperty Name="Shift" Relationship="AdventureWorks2012Model.FK_EmployeeDepartmentHistory_Shift_ShiftID" FromRole="EmployeeDepartmentHistory" ToRole="Shift" />
</EntityType>
Please help I've been stuck on this for days. I've tried deleting it and re-adding it but to no avail.

EmployeeDepartmentHistory and this table itself has a primary key on it?

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