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I have this RESTful controller enabled on my APEX Site to test email templates:

@RestResource(urlMapping='/Activations/*')
global class ActivationController {

    @HttpGet
    @HttpPost
    global static String email() {
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        mail.setTemplateId('00X3B000000HxnRUAS');
        mail.setTargetObjectId('0033B00000BwGiiQAF');
        mail.setWhatId('a033B000001P8vMQAS');
        mail.setSaveAsActivity(false);
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
    }
}

I am trying to use this email template:

<messaging:emailTemplate subject="Subject" recipientType="Contact" relatedToType="Activation__c">
<messaging:htmlEmailBody >
<html>
   <body>
      {!recipient.FirstName}
   </body>
</html>
</messaging:htmlEmailBody>
</messaging:emailTemplate>

When I run it, I get this error:

System.EmailException: SendEmail failed. First exception on row 0; first error: INVALID_CROSS_REFERENCE_KEY, invalid cross reference id: [] Class.ActivationController.email

If I delete {!recipient.FirstName} from the template, I don't get the error anymore.

How can I show the contact's first name in the email? Is this a permissions thing? What am I doing wrong? Please note that the IDs I am using are absolutely valid. In addition, they reference the correct type of object they need to reference in order to populate SingleEmailMessage parameters correctly.

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1 Answer 1

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This looks like a known bug with relatedTo.{x} fields.

As a workaround, I've added a Contact object onto the relatedToType and used {!relatedTo.Contact__r.FirstName}.

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