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Now that you can get Pulumi to lock state during deployments, it is best to use one URL for all projects that are able to access each other via StackReference.

There is a risk of collision when two projects share a single unlocked backend (S3 bucket URL), but that's mitigated by Pulumi's locking.

And you cannot use StackReferences between projects with different backend URLs.

thanks <@U012UJTT55M>, We have decided to go with different bucket for different stack/env