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Not able extract response header values from target endpoint

My variable policy configuration is as below: I could see from target response headers I am getting value for Tr-ui-Yui variable header.

It's value is {"test":"data","test1":"data1"}. But I could not see the variable at all in ExtractVariablePolicy used in TargetPreFlow (Response flow side).

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ExtractVariablesasync="false"continueOnError="false"enabled="true"name="Extract-Variables-1">
<Source>response</Source>
<DisplayName>Extract Variables-1</DisplayName>
<Headername="Tr-ui-Yui">
<PatternignoreCase="false">{myvalueNew}</Pattern>
</Header>
</ExtractVariables>
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