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Are you using the pulumi backend or some other option? And was this project executed under a stack before?

Then you will first have to login to that backend created in S3
`pulumi login ${URL to S3}`

And if the backend already have a stack then run
`pulumi stack select &lt;stack_name&gt;`

Ok I did it and I get:
```❯ pulumi login <s3://xxx-xxx-xxx>
Logged in to MacBook-Air.local as line (<s3://xxx-xxx-xxx>)
❯ pulumi up
error: could not query backend for stacks: error listing stacks: could not list bucket: blob (code=Unknown): MissingRegion: could not find region configuration```

Were the AWS credentials exported? The AWS_REGION is missing

Yes I exported the AWS credentials, but I should export the region also ?

I get:
```❯ export AWS_REGION=eu-central-1
❯ pulumi up
error: could not query backend for stacks: error listing stacks: could not list bucket: blob (code=Unknown): NoCredentialProviders: no valid providers in chain. Deprecated.
	For verbose messaging see aws.Config.CredentialsChainVerboseErrors```
whereas I set my credentials :disguised_face:

Does your credentials have the necessary permission to read/list the bucket in S3?

I think now it is okay I did the exports again and it finds the stack. Thanks a lot :slightly_smiling_face: