This Error:
The ‘ObjectContent`1’ type failed to serialize the response body for content type ‘application/xml; charset=utf-8’.

can be fixed by adding one line of code to your data model’s context class

public partial class YOURENTITYCLASS: DbContext
public YOURENTITY(){
base.Configuration.ProxyCreationEnabled = false;

Many times it triggers when you have foreign key constraints within your Entity Data Model.

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