Node.js app can't access any env variables when pm2 is started from a script but can when launched from ssh

I am trying to launch a node.js app on a production EC2 server with pm2 process manager.

When I ssh into the instance and run pm2 start app.js, PM2 starts just fine and has access to all environment variables. Everything good.

However, I want to run pm2 start app.js from a Codedeploy hook script called applicationstart.sh, the app fails with an errored status becasue it is missing all environment variables.

Here is where the script is added so it is launched with each deployment and calls pm2 start: appspec.yml

version: 0.0
os: linux
files:
  - source: /
    destination: /home/ubuntu/teller-install
hooks:
  AfterInstall:
    - location: scripts/afterinstall.sh
      timeout: 1000
      runas: root
  ApplicationStart:
    - location: scripts/applicationstart.sh
      timeout: 300
      runas: ubuntu

Here is the applicationstart script:

#!/bin/bash

echo "Running Hook: applicationstart.sh"
cd /home/ubuntu/teller-install/Server/
pm2 start app.js
exit 0

I am logged in as ubuntu when I run the script from ssh and I set the script in the appconfig.yml to run as ubuntu as well.

Why would there be any difference between starting pm2 from terminal and starting it from a launch hook script?

Here is running directly from ssh:

I can provide any information necessary in dire need of solution. Thanks!

via s_kirkiles