Hi guys! I need your help.
In my development environment, sending email using Bamboo(Mailgun adapter) is working fine.
But in my production, I got error like below.

** (ArgumentError) argument error                                                                                                                            
(bamboo 1.5.0) lib/bamboo/adapters/mailgun_adapter.ex:120: Bamboo.MailgunAdapter.full_uri/1                                                                  
(bamboo 1.5.0) lib/bamboo/adapters/mailgun_adapter.ex:100: Bamboo.MailgunAdapter.deliver/2                                                                   
(elixir 1.10.3) lib/task/supervised.ex:90: Task.Supervised.invoke_mfa/2                                                                                      
(stdlib 3.13) proc_lib.erl:226: :proc_lib.init_p_do_apply/3                                                                                                  
Function: #Function<0.1924921/0 in Bamboo.TaskSupervisorStrategy.deliver_later/3>                                                                            
Args: []

I double checked to config vars name and value.

in config.exs

config :my_app, MyApp.Emails.Mailer,
  adapter: Bamboo.MailgunAdapter,
  api_key: System.get_env("MAILGUN_API"),
  domain: System.get_env("MAILGUN_DOMAIN_NAME"),
  base_uri: System.get_env("MAILGUN_BASE_URI")

I don’t know why this is happening…
Because args are empty? I can see Args: [] in log.
So maybe not passing any config value correctly?(api key, domain name, base uri)?
I tested in Production iex session
System.get_env("MAILGUN_API") it returns correct value. hmmm

Email.contact_admin("category", "John", "john@gmail.com", "hi my friend")
 |> Mailer.deliver_now(config: %{api_key: "api_key", domain: "domain name", base_uri: "https://api.mailgun.net/v3"})

I tried this in Production iex session and it works!.
So What am I missing? Any idea?