messaging/unknown-error when using sendEachForMulticast

[davideicardi]

• Operating System version: AWS Lambda
• Firebase SDK version: firebase-admin 12.3.0 (but also previous versions)
• Firebase Product: message notification
• Node.js version: Node.JS 18
• NPM version: 9

I have a project that send notification messages to Android and IoS. We use sendEachForMulticast method. It worked fine for several months. But recently we started to receive the following error:

{
"code":"messaging/unknown-error"
"message":"Operation is not implemented, or supported, or enabled. Raw server response: "{"error":{"code":501,"message":"Operation is not implemented, or supported, or enabled.","status":"UNIMPLEMENTED"}}""
}

We create the messages, using the MulticastMessage type, with the following structure:

{
      tokens: [token1, token2],
      data: {
         // ... (string->string)
      },
      android: {
        priority: 'normal',
        ttl: TTL_SECONDS * 1000,
      },
      fcmOptions: {
        analyticsLabel: 'my-label',
      },
      apns: {
        payload: {
          aps: {
            alert: {
              titleLocKey: 'key1',
              locKey: 'key2',
              locArgs: ['value1'],
            },
          },
          contentAvailable: true,
        },
        headers: {
          'apns-expiration': `${Math.floor(Date.now() / 1000) + TTL_SECONDS}`,
        },
      },
    };

Any ideas of what can be the problem? It could be related to https://firebase.google.com/docs/cloud-messaging/migrate-v1?authuser=0&hl=en ?

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[davideicardi]

Sorry, my fault. I still used sendMulticast deprecated method.