[SalesForce] actionSupport rerender not working as expected

I have the below code and I am trying to make the Call_Outcome__c field required based on what value was selected for Type field:

<apex:pageBlockSectionItem>
    <apex:outputLabel value="Type" for="taskTypeIdOne"></apex:outputLabel>
    <apex:actionRegion>
        <apex:inputField value="{!taskObjOne.type}" required="TRUE" id="taskTypeIdOne">
            <apex:actionSupport event="onChange" reRender="taskOneCallOutcomeOPPanelId"/>
        </apex:inputField>
    </apex:actionRegion>                
</apex:pageBlockSectionItem>

<apex:pageBlockSectionItem>
    <apex:outputLabel value="Call Outcome" for="taskOneCallOutcomeId"/>
    <apex:outputPanel id="taskOneCallOutcomeOPPanelId">
        {!taskObjOne.type} <!-- This always displays call on the UI-->
        <apex:inputField value="{!taskObjOne.Call_Outcome__c}" 
                        required="{!IF(taskObjOne.type =='Call',"TRUE","FALSE")}" 
                        id="taskOneCallOutcomeId"/>              
    </apex:outputPanel>
</apex:pageBlockSectionItem>

Call_Outcome__c field is always displayed as required irrespective of what I select for Type field and the {!taskObjOne.type} component inside the outputpanel always displays the initial value of type field on page load.

What is wrong with this code?

Best Answer

I got something similar to work in my org just by making the event name all lower-case:

<apex:actionSupport event="onchange"  reRender="taskOneCallOutcomeOPPanelId"/>

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