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It depends on the provider. Many don't really do network operations on preview so they just need an account for initial configuration to pass.

i am basically following the example here

<https://www.pulumi.com/docs/guides/continuous-delivery/gitlab-ci/>

but you can see it has a "preview" branch that only runs on merge requests, which is what I'm guessing how "preview" is supposed to be used

aws-native doesn't do cloud operations during preview. So I think it will just do an account existence check at configure time.
aws depends on what terraform does, which I don't think it does any cloud operations but haven't checked.

Most of preview is just diffing based on the values of things in the state file.

i'm using crosswalk here, not sure if that's aws-native or aws