MetaHuman Creator (in-editor plugin) AutoRig + texture download fail with a 300s HTTP timeout / "Server Error" from non-US regions (5.6/5.7/5.8, regression from 5.5)

Posting a related report with a US-route reproduction:

Same endpoint and same 300s failure, but with no LogHttp connection errors in any run, so the routing half of your diagnosis doesn’t apply on my side. Joints Only completed cleanly at 198.243s and 153.145s in the same sessions the Full Rig attempts failed.

One detail that may matter for both of us: the request that times out is a status poll with waitSeconds=10. So the client isn’t waiting on the solve duration, it’s waiting on a poll that should have returned in ten seconds and never did. That would explain why Full Rig still failed for you over a clean US VPN route even though Joints Only started succeeding.