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The simplest thing is just setting the AWS provider configuration via stack configuration. Then only the prod stack would use the pros account a configuration, and similar for dev. 

Is there some aspect of what you want to ensure that this does not achieve?  There are several other tools/patterns you can use - but depend a bit on more details of what you want to accomplish. 

right. I just found this: <https://www.pulumi.com/docs/intro/cloud-providers/aws/#configuration>, which seems to be exactly what you suggest/what tf does. and it does seem like the correct way, I will try it now. Thank you!