Receiving Installation-validation postback using SKAdNetwork

Hi,

I am using App Store Connect Campaign Links on my campaigns, like email campaign, Facebook and Instagram campaigns.

I would like to know which campaign is going good.

For that, i have done the below two steps to track app installation and campaign details, like Source of installation.

1. Set NSAdvertisingAttributionReportEndpoint in info.plist
2. SKAdNetwork.updatePostbackConversionValue(0) in didFinishLaunching

Also, enabled the server endoint report-attribution to accept HTTP POST messages.

Now, i am trying to test the postback from TestFlight build of my app.

But i am getting the below error in console.

• Error setting developer pingback domain for app: <MY_APP_ID>, error: (null), result: 0

Am i doing anything wrong? Please advise,

Thank you.