I'm not using the iframe implementation for AMP, but rather manually including the document referrer as variable "r".
{
requests: {
base: 'https://${trackingServer}/b/ss/${accounts}/1/AMP-0.1/s${random}'
pageView: 'pageView' => '${base}?AQB=1&vid=CLIENT_ID(adobe_amp_id)&j=amp&AQE=1&r=${documentReferrer}'
}
However, "r" doesn't appear to be populating the report suite. Can you advice?