When searching for UE4 terms on , I’ll frequently see search results from the domains https://rocket1.unrealengine.cloud.answerhub.com and https://rocket2.unrealengine.cloud.answerhub.com, which seem synonymous with https://answers.unrealengine.com/. The issue is that they’re all serving up the same SSL cert, which is only valid for that last domain.
Perhaps consider setting up some kind of e.g. rel="canonical" metadata to hint at the indexing to prefer the correct domain?
See also: https://support…com/webmasters/answer/139066?hl=en