Push notification issue

I've configured Sygnal and Synapse with the help of ansible playbook.

I'm not receiving notifications in Android and iOS Devices.

Here's configurations and logs I've got.

sygnal.yaml

apps:
  chat.co:
    api_key: <api-key>
    key_id: <key-id>
    keyfile: /data/AuthKey.p8
    team_id: <team-id>
    topic: chat.co
    type: gcm
  me.co:
    api_key: <api-key>
    type: gcm
http:
  bind_addresses:
  - '::'
  port: 6000
log:
  access:
    x_forwarded_for: true
  setup:
    disable_existing_loggers: false
    formatters:
      normal:
        format: '%(asctime)s [%(process)d] %(levelname)-5s %(name)s %(message)s'
    handlers:
      stderr:
        class: logging.StreamHandler
        formatter: normal
        stream: ext://sys.stderr
      stdout:
        class: logging.StreamHandler
        formatter: normal
        stream: ext://sys.stdout
    loggers:
      sygnal:
        handlers:
        - stderr
        propagate: false
      sygnal.access:
        handlers:
        - stdout
        level: INFO
        propagate: false
    root:
      handlers:
      - stderr
      level: INFO
    version: 1
metrics:
  opentracing:
    enabled: false
    implementation: jaeger
    jaeger:
      logging: true
      sampler:
        param: 1
        type: const
    service_name: sygnal
  prometheus:
    address: 0.0.0.0
    enabled: false
    port: 8000
  sentry:
    enabled: false

Docker logs:

Using configuration file: /config/sygnal.yaml
2022-06-29 14:31:29,611 [1] INFO  __main__ Importing pushkin module: sygnal.gcmpushkin
2022-06-29 14:31:29,625 [1] INFO  __main__ Creating pushkin: GcmPushkin
2022-06-29 14:31:29,625 [1] WARNING sygnal.gcmpushkin The following configuration fields are not understood: {'topic', 'keyfile', 'key_id', 'team_id'}
2022-06-29 14:31:29,632 [1] INFO  __main__ Importing pushkin module: sygnal.gcmpushkin
2022-06-29 14:31:29,632 [1] INFO  __main__ Creating pushkin: GcmPushkin
2022-06-29 14:31:29,638 [1] INFO  __main__ Configured with app IDs: dict_keys(['chat.co', 'me.co'])
2022-06-29 14:31:29,638 [1] INFO  __main__ Starting listening on :: port 6000
2022-06-29 14:31:29,643 [1] INFO  twisted SygnalLoggedSite starting on 6000
2022-06-29 14:31:29,644 [1] INFO  twisted Starting factory <sygnal.http.SygnalLoggedSite object at 0x7fd1c72a8810>
2022-06-29 17:34:31,794 [1] INFO  sygnal.gcmpushkin [d1165063-2c94-673a-9e21-f62e0907bf50] Sending (attempt 0) => ['<hash-string>']
2022-06-29 17:34:31,797 [1] INFO  sygnal.gcmpushkin [de9fd1e9-7b44-2ca1-qf12-2d2a2e734390] Sending (attempt 0) => ['<hash-string>']
2022-06-29 17:34:31,802 [1] INFO  twisted Starting factory _HTTP11ClientFactory(<function HTTPConnectionPool._newConnection.<locals>.quiescentCallback at 0x7fd1c7206830>, <twisted.internet.endpoints._WrapperEndpoint object at 0x7fd1c7202d10>)
2022-06-29 17:34:31,803 [1] INFO  twisted Starting factory _HTTP11ClientFactory(<function HTTPConnectionPool._newConnection.<locals>.quiescentCallback at 0x7fd1c7145710>, <twisted.internet.endpoints._WrapperEndpoint object at 0x7fd1c716fd50>)
2022-06-29 17:34:31,861 [1] WARNING sygnal.gcmpushkin [de9fd1e9-7b44-2ca1-qf12-2d2a2e354390] Error for pushkey <hash-string>: NotRegistered
2022-06-29 17:34:31,862 [1] INFO  sygnal.gcmpushkin [de9fd1e9-7b44-2ca1-qf12-2d2a2e354390] Reg ID '<hash-string>' has permanently failed with code 'NotRegistered': rejecting upstream
2022-06-29 17:34:31,862 [1] INFO  sygnal.http [de9fd1e9-7b44-2ca1-qf12-2d2a2e734390] Successfully delivered notifications with 1 rejected pushkeys

I'm not sure what is wrong here. Your responses and help would be very appreciated.

Thanks.

matrix-org / sygnal

Push notification issue #311