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Are you sure that you have valid AWS credentials? This can possibly happen when you have AWS credentials that are expired. https://github.com/pulumi/pulumi-aws/issues/814

Thx, for the fast response. I have double checked, the aws-cli works fine.

Yup, definitely sounds odd. Please open an issue with the code needed to reproduce the issue. This isn’t something that we’ve seen at all in our own usage of Automation API so you’ll need to be very specific about your setup.

Are you running the parent function in a try catch or with a promise exception handler?

Thx Evan, seems like express doesn't forward exceptions

CommandError: code: 255
 stdout: 
 stderr: error: PULUMI_ACCESS_TOKEN must be set for login during non-interactive CLI sessions

 err?: 

    at Object.createCommandError (/home/secustor/repos/pulumi-automation-api/node_modules/@pulumi/pulumi/automation/errors.js:71:17)
    at ChildProcess.<anonymous> (/home/secustor/repos/pulumi-automation-api/node_modules/@pulumi/pulumi/automation/cmd.js:63:40)
    at ChildProcess.emit (events.js:315:20)
    at ChildProcess.EventEmitter.emit (domain.js:467:12)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:277:12)
    at Process.callbackTrampoline (internal/async_hooks.js:131:14) {
  commandResult: CommandResult {
    stdout: '',
    stderr: 'error: PULUMI_ACCESS_TOKEN must be set for login during non-interactive CLI sessions\n',
    code: 255,
    err: undefined
  }
}

One thing to consider, automation api operations in nodejs return promises. These promises can reject and you need to handle errors accordingly. The try/catch error handling in the automation api express example might be a useful reference: https://github.com/pulumi/automation-api-examples/blob/main/nodejs/pulumiOverHttp-ts/index.ts#L63-L85