Delivery: Preview mode returns Error

Hi,

I'm creating a delivery in Adobe campaign with AEM content.

while having the content synchronized and I'm able to view to view the content in the HTML & Source Tab of campaign.

But when clicking on the preview mode and selecting personalization, I'm receiving an error "INT-150012 The HTTP query returned a 'Found' type error (302)"

The original call (/libs/mcm/campaign/content/newsletters/9ae7db91-8601-4e75-8945-534ec3118ab4.json) is being redirected to "/content/campaigns/BoseBrand/BoseArea/BoseCampaign/testbert2.json " but why is campaign failing to retrieve the content?

The same call is being made when synchronizing the content from AEM to Campaign, and then no errors are returned;

Acces log of our server also noticed a 302:

admin 17/Nov/2017:11:33:53 +0000 "GET /libs/mcm/campaign/content/newsletters/9ae7db91-8601-4e75-8945-534ec3118ab4.json HTTP/1.1" 302 - "-" "Adobe-Campaign/6.1"

10.145.5.142 - admin 17/Nov/2017:11:33:53 +0000 "POST /content/campaigns/BoseBrand/BoseArea/BoseCampaign/testbert2.campaign.content.json?delivery=DM215 HTTP/1.1" 200 7174 "-" "Adobe-Campaign/6.1"