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Setting this env variable worked for me:
&gt; Enter your passphrase to unlock config/secrets
&gt;    (set PULUMI_CONFIG_PASSPHRASE to remember):

<@UJ8SBMLF6> Oh ! you are right, I thought this was ONLY to unlock the secret store, but actually it WORKS for initializing stacks too.  Could not find this info anywhere in the docs, maybe I missed it. Thank you.

You're welcome. Pulumi is under heavy development but it looks promising.