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What backend are you using? I.E. Pulumi SaaS, blob storage, local files, etc..

Pulumi SaaS for the deployment. Our Projects are written in Typescript.

Ok so that weeds out the error I was thinking of. You're not getting an error in project 2 during deployment at all? Can you see the state for both project 1 and project 2 in the pulumi portal?

Project 1 is deployed flawlessly. Project 2 does not, because it tries to create the ResourceGroup that already exists. This is also displayed as an error. I have replaced customer data with xxx

Type                                     Name                                    Plan       Info
     pulumi:pulumi:Stack                      xxxx-dev                    1 error
 +   └─ azure-native:resources:ResourceGroup  xxx-resource-group-dev  create     2 errors
 
Diagnostics:
  pulumi:pulumi:Stack (xxx-dev):
    error: preview failed
 
  azure-native:resources:ResourceGroup (xxx-resource-group-dev):
    error: Duplicate resource URN 'urn:pulumi:dev::xxxx::azure-native:resources:ResourceGroup::xxx-resource-group-dev'; try giving it a unique name
    error: Preview failed: resource '/subscriptions/<subscriptionid>/resourceGroups/xxx-resource-group-dev57917a4a' does not exist

I replied in #CRVK66N5U You shouldn’t have a declaration for the resource group in the second stack. Instead in the second stack, reference the name of the RG created in the first stack.

Ah I didn't realize that was what he was doing. Yes Pulumi has a DSL, by declaring it in both stacks you are telling both stacks to provision it.

@witty-candle-66007 @bored-oyster-3147 Thanks for the quick reply. With the stack reference - as Mitch said - it works now! 🙌