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I tried something similar to this and it worked for me.

Are you providing credentials to the input to your `Provider`? (or getting them from ambient AWS configuration?)

Weird running pulumi up like `AWS_SDK_LOAD_CONFIG=true pulumi up` fixed the above.

I've been using that provider fine for building everything else

Ahh - are your credentials in `~/.aws/config`?  Are you using a `profile` here?

provider is defined like above where profile is the profile name to use.

I think this might be a bug somewhere since I don't need AWS_SDK_LOAD_CONFIG=true for the resources, only those data calls

Yes - this does sound like it might be a bug.  Could you open an issue to track this?

<https://github.com/pulumi/pulumi-aws/issues/794>