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Are you sure that cluster id exists? Can you run the import with

--logtostderr --logflow -v10

and post that log somewhere (emailing to fraser@pulumi.com is fine).

yes it exists

Looks like aws isn't finding that:

Validate Response elasticache/DescribeCacheClusters failed, attempt 0/25, error CacheClusterNotFound: CacheCluster not found: infra-storage-thai-test-v2

Might be worth raising an issue at github.com/pulumi/pulumi-aws about it, they might know more about what could be causing describe to not find the cluster