Sorry for the late response.
QuoteI think Opera has some sort of built-in content-blocker that might be the issue here.
Yes it does, but both the built-in one and the AdBlock Plus addon were disabled.
That's why Ads were visible on the screen.
Then I noticed that the Tracker Blocker was still on.
Turning it off fixed it and allowed Aternos to detect if Ads have access.