FoxLearn sandbox is an attribute for iframes, which is what the ad creative is in and is returned/handled entirely by the ad provider, so Ezoic wouldn't have any control over this as we serve ads coming from our network partners - e.g advertisers bidding in the Google Ad Exchange.
With regards to the 'attestation check for topics' error - I was unable to reproduce this on my end (i'm in chrome on desktop looking at the hompage in the dev tools console). can you share some more examples of how we might replicate this on our end. Thanks