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I am not sure if this could be the problem, when I compare the AppKey, it seems that the old AppKey configured previously is no longer valid on the Datadog Console, and from the state file, it seems saving the AppKey value, in this case, can we replace the old AppKey with a new one in the state file to recover it?

think I've resolved this by replacing the hardcoded appkey value with the new app key. Will use the pulumi runtime environment instead to keep our state file as free as possible

You can safely add those keys by doing `pulumi config set --secret`

Pulumi will only store the encrypted value - no secrets in plaintext.