Asynchronous Pushing not Working for IOS

[asgharkhan11]

Environment

• Elixir 1.12.2 (compiled with Erlang/OTP 24)
• Ubuntu

Asynchronous Push to IOS not working without giving any error just callback function never called.
if i send the notification like below the on_response never being called without any error
Pigeon.APNS.push(notification, on_response: on_response)

if i send the notification like below
{:ok, pid} = Pigeon.APNS.start_connection(cert: apns_cert, key: apns_key, mode: apns_mode)
Pigeon.APNS.push(notification, to: pid)

The notifications work properly then.

Note: configuration and certs are all ok and the code working in older version of elixir and Erlang

[hpopp]

Which older versions of Elixir and Erlang and what version of Pigeon are you using?