I am running elixir version 1.10.4 on Centos 7 and having trouble with runtime.exs fetching environment variables configured in the systemd service.

The same setup works on Ubuntu 20.04 but running elixir 1.11.4.

My assumption was runtime.exs was introduced in version 1.10.* and should therefore work? If so, what other option do I have because the values are defined in a systemd service that looks like this:

[Unit]
Description=My Service
After=network.target
StartLimitIntervalSec=0

[Service]
Type=simple
EnvironmentFile=/etc/systemd/system/myservice.conf
ExecStart=/home/applicationuser/myservice/prod/rel/myservice/bin/myservice start
ExecStop=/home/applicationuser/myservice/prod/rel/myservice/bin/myservice stop
Restart=on-failure
User=applicationuser
StartLimitIntervalSec=45
[Install]
WantedBy=multi-user.target