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how are you configuring Pulumi's access to AWS? environment variable, config?

which variables? the error is coming from the AWS GO SDK and isn't related to pulumi, - it seems however you're configuring things is a bit off

I login with aws sso and then I set config aws:region ... am i forgetting something?

see here: <https://github.com/jaxxstorm/aws-sso-creds>