IAM is seems to be run out of North Virginia (other than Gov Cloud)[0]. However they probably may be doing some magic under the covers to reduce latency across the globe. It would also explain why GovCloud isnt affected.
Yeah certainly the existence of credentials etc must be replicated to deal with cross-region connectivity issues etc. - which I guess explains why authentication is still working fine
GovCloud I believe is technically separated in this regard, I don't think IAM credentials can operate across partitions.
Though it does seem to be possible to link the existence of a standard AWS account with GovCloud, the same is not true of the China partition
GovCloud I believe is technically separated in this regard, I don't think IAM credentials can operate across partitions.
Though it does seem to be possible to link the existence of a standard AWS account with GovCloud, the same is not true of the China partition