# Engineering Elixir Applications - Trigger Autoscale

**URL:** <https://forum.devtalk.com/t/engineering-elixir-applications-trigger-autoscale/219777>\
**Category:** PragProg Customers\
**Tags:** book-engineering-elixir-applications, engineering-elixir-applications\
**Created:** [22 October 2025 19:36 UTC](https://forum.devtalk.com/t/engineering-elixir-applications-trigger-autoscale/219777 "2025-10-22T19:36:21Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![elliefairholm](https://forum.devtalk.com/letter_avatar_proxy/v4/letter/e/e0b2c6/32.png) [@elliefairholm](https://forum.devtalk.com/u/elliefairholm)\
**Post date:** [9 November 2026 03:10 UTC](https://forum.devtalk.com/t/engineering-elixir-applications-trigger-autoscale/219777/2 "2026-11-09T03:10:20Z")

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Hello @hjemmel, I’m so sorry for the latest reply ever here.

The AWS region automatically defaults to `eu-west-1`, so it looks like the app is not finding your autoscaling group when calling the AWS API. You can set the region to be `ap-southeast-2` by adding the `AWS_REGION` environment variable to the `web` service in your `compose.yaml` file.

Hope that works!

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