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Are you using named profiles? (is aws:profile set?), if so, you have to provide `providerCredentialOpts`

like so:
```  providerCredentialOpts: {
        profileName: aws.config.profile,
        roleArn: yourRoleHere.arn
      },```

see source: <https://github.com/pulumi/pulumi-eks/blob/1bcbb24dd24d44e07f34cfed40050e31c65646cd/nodejs/eks/cluster.ts#L1315>'