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In URI templates, you cannot use get-property directly. To use a property value in a URI template, you must format it correctly as {uri.var.propertyName}.

change the following property definition:

<property expression="concat(get-property('TokenEndpoint'), '?client_id=', get-property('client_id'), '&amp;client_secret=', get-property('client_secret'))" 
          name="tokenRequestUrl" 
          scope="default" 
          type="STRING"/>

to:

<property expression="concat(get-property('TokenEndpoint'), '?client_id=', get-property('client_id'), '&amp;client_secret=', get-property('client_secret'))" 
          name="uri.var.tokenRequestUrl" 
          scope="default" 
          type="STRING"/>

Additionally, update the http element:

Change:

<http method="GET" uri-template="{get-property('default', 'tokenRequestUrl')}">

to:

<http method="GET" uri-template="{uri.var.tokenRequestUrl}">

For more information - http://medium.com/@Jenananthan/wso2-esb-construct-dynamic-urls-67fad2f6d34c

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