Web Analytics Connector and LinkName

Question

I've recently setup Web Analytic Connector (WAC). I'm now trying to customize the WAC string to return a static value in the utm_contact parameter when no link alias is assigned. By default this parameter returns the URL of the link.

Here is the initial code used, which does successfully deploy the email.

&utm_content=%%linkname%%

When I make the following edits, the email job cancels.

&utm_content=%%=iif(IndexOf(linkname,"http")>0, linkname,"unknownlink")=%%

I've used custom ampscript in the WAC strings before, but never in reference to the linkname personalization string. Is this possible? Any suggestions on how I might customize the utm_content output?

update

SFMC Support provided the following details on the email job that was cancelled after the WAC update.

MemberID: xxxxxxxxx JobID: yyyyy OMMSlotID zzzzzz 
ExactTarget.OMM.InvalidScriptException: An error occurred when attempting to resolve a function call. See inner exception for detail.
Function Call: iif(IndexOf(linkname,"http")>0, linkname,"unknownlink")
Index: 208
Content Type: Text
Substitution Level: Subscriber
Message Context: Unknown
Error Code: OMM_SCRIPT_SYNTAX_ERR
- from OMMCommon --> 

--- inner exception 1---

ExactTarget.OMM.InvalidScriptException: An error occurred when attempting to resolve a script expression. See inner exception for detail.
Script Expression: IndexOf(linkname,"http")
MemberID: xxxxxxxxx
JobID: yyyyy
Error Code: OMM_SCRIPT_SYNTAX_ERR
- from OMMCommon --> 

--- inner exception 2---

ExactTarget.OMM.InvalidFunctionException: The specified attribute or custom object field name was not found for this client.
Function Call: IndexOf(linkname,"http")
Attribute or Field Name: linkname
Error Code: OMM_FUNC_SYNTAX_ERR
- from OMMCommon

Answer 1

Thanks @Gortonington for you comment. I took a closer look at the online documentation. There must be something special to this personalization string. The documentation states, "This personalization string is only available in use with the web analytics connector."

Unfortunately, I wasn't able to solve for my issue. But, I believe I've confirmed why it doesn't work.

I made the following update to my WAC string.

&utm_content=%%=iif(IndexOf(AttributeValue("linkname"),"http")>0, AttributeValue("linkname"),"unknownlink")=%%

I was able to successfully deploy emails after the update. But, all the links in my email had a utm_content value of "undefinedlink". To me, this means linkname must not yet be defined at the point this ampscript executes.