Google fiber being blocked??

The same result here using Rogers in Canada, trying to get today's released Server Insider ISO.  I also had this problem a few days ago when attempting to download the latest Canary client ISO for testing, and that's still broken also.

I also tried downloading using a remote machine on a different ISP, and a brand new Insider account, the same error on there.

For those looking to reproduce, the error is generated after the language is chosen (getskuinformationbyproductedition api), everything looks fine until then.

If you look at the response where the error is generated in the browser dev tools (Network tab), the response to https://www.microsoft.com/software-download-connector/api/GetProductDownloadLinksBySku?profile=606624d44113&ProductEditionId=undefined&SKU=19903&friendlyFileName=undefined&Locale=en-US&sessionID=[guid]  ([guid] is a real guid in the request)

is:

{
	"Errors": [
		{
			"Key": "ErrorSettings.SentinelReject",
			"Value": "Sentinel marked this request as rejected.",
			"Type": 9
		}
	]
}

I noticed it's also now blocked in Fido and Rufus (neither of which I've used to download ISOs before), per this GitHub issue:

https://github.com/pbatard/Fido/issues/106

There is a guess there that blocked requests to ov-df.microsoft.com might cause it, but in my second test on a remote PC, these wouldn't have been blocked at all (unless a default Edge install with no extensions blocks it).