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is everything in the same s3 backend?

Yes, but different folders. Example, • project1 I need to login as:

<s3://mybucket/project1>

• project2 I need to login as:

<s3://mybucket/project2>

no that's not possible, the login needs to be the same

Thanks for the previous comment, I tried to do myself as follow:

pulumi login <s3://mybucket>
pulumi new aws-python -n project1 # creating stack prod
pulumi new aws-python -n project2 # creating stack prod

But this gives me an error. How should I proceed with local backends and multiple projects and stacks and have the stack reference work?

you need to prefix your project and stack, like so: pulumi stack init project1.prod pulumi stack init project2.prod

Ok, thank you very much!