If you use third-party served creatives in Amazon DSP, which of the

When directing to an Amazon Ads site for mobile in-app ads with third-party tags, Amazon Ads requires using a 1×1 pixel and not a redirect.
If you are running creatives served through a third-party on eligible Amazon DSP inventory, you will need to append your third-party tag in the tag source section of creative settings.
All content must be served from the ad server’s domain and may not call from other domains. Only secured calls (https://) are accepted.
Amazon Ads accepts third-party hosted creative libraries from all third-party ad servers.