If you want to use a config from different imported environments in a different project, you need to create a key called exactly “pulumiConfig” in your stack.

Example in project A you have a Pulumi.staging.yaml file with some configs:

environment:
  - default/staging
  - web/staging
  - web/en_ca
config:
  website:service: app
  website:port: '3000'
  website:minReplicas: '1'
  website:maxReplicas: '5'
  website:memoryRequest: '512Mi'
  website:cpuRequest: '250m'

  website:wafConfig:
    seo:
      enabled: true
      gtMetrixEnabled: true
...

In your Pulumi infra code file (let's say index.ts if you are using typescript), you want to reference a variable called myvar1 that you want to store in a web/staging Pulumi environment, you need to set it like this:

pulumi env set icg/web/staging pulumiConfig.myvar1 "myvalueblabla" --secret

Otherwise you will get an error similar to

    error: Missing required configuration variable 'website:myvar1'
        please set a value using the command `pulumi config set --secret website:myvar1 <value>`

because its actually loooking for it in above local file under website key instead of in one of the environments.

Example index.ts:

...
const config = new pulumi.Config();
...
const var1 = config.requireSecret("myvar1") 
...

• Pulumi v3.154.0 (03.2025.)

• https://www.pulumi.com/docs/esc/environments/working-with-environments/