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Not directly answering your question, but relevant parts of documentation seem to be <https://www.pulumi.com/docs/intro/cloud-providers/aws/setup/> and <https://www.pulumi.com/docs/intro/cloud-providers/aws/#configuration>

yup, went through that. I tried both the environment variable “export AWS_PROFILE=…” and the pulumi config “pulumi config set aws:profile …”

Sorry, that's as far as I'm able to help with this one. Maybe someone else will know better.