How to merge two or more environments - php

Question

I'm writing an acceptance test suite and I have to make the environment easily configurable, but for this to work I need to be able to merge two or more environments (geoLocation, browser, os, URLs).
If I run: .\codecept run tests\acceptance\acceptanceTestCest --env firefox the tests start running without issues with any environment I choose.
Now my problem is that if I try to merge the environments: .\codecept run tests\acceptance\acceptanceTestCest --env firefox,US I get the following message:
In Configuration.php line 306:
[Codeception\Exception\ConfigurationException]
Suite tests\acceptance\acceptanceTestCest.php was not loaded
And if I try to merge more than two environments I get this message:
Too many arguments, expected arguments "command" "suite" "test".
This is how my acceptance.suite.yml looks like:
actor: AcceptanceTester
modules:
enabled:
- WebDriver:
url: http://localhost
- REST:
depends: PhpBrowser
url: 'http://localhost/api/'
- \Helper\Acceptance
config:
WebDriver:
host: 'user:key#hub.browserstack.com'
port: 3214
browser: chrome
capabilities:
os: Windows
os_version: 10
browserstack.local: true # for local testing
env:
AU:
modules:
config:
WebDriver:
capabilities:
browserstack.geoLocation: AU
US:
modules:
config:
WebDriver:
capabilities:
browserstack.geoLocation: US
CA:
modules:
config:
WebDriver:
capabilities:
browserstack.geoLocation: CA
firefox:
modules:
config:
WebDriver:
browser: firefox
safari:
modules:
config:
WebDriver:
browser: safari
I looked everywhere for this issue and I did not find anyone that even encountered it. The closest thing I found was that tests would be ran only with the second environment.
I'm new to Codeception and probably I am missing something.
I read the documentation on https://codeception.com/docs/07-AdvancedUsage#Environments and I don't seem to do anything wrong from there.
Codeception version is 2.4.5
PHP version is 7.2.8
Operating system: Windows Server 2012
Installation type: Composer 1.7.2
Things I tried:
Put the environments in _envs folder.
Put the environments in codeception.yml
Also I have the project on Jenkins as well and merging environments works perfectly there, but if I try to download the exact same project and run it locally it still doesn't work.