Can't get appAccountToken on server side

[quentinNpApnl]

Hi ! I can't get my appAccountToken on server side, am I doing something wrong ? I am using react-native-iap version ^12.0.3

                await requestSubscription({
                    sku: productId,
                    appAccountToken: user?.uuid,
                    obfuscatedAccountIdAndroid: user?.uuid,
                    ...(offerToken && {
                        subscriptionOffers: [{sku: productId, offerToken}],
                    })
                })

the server receives this through the JWSTransactionDecodedPayload:

"transaction":{
      "transactionId":"***",
      "originalTransactionId":"***",
      "webOrderLineItemId":"***",
      "bundleId":"***",
      "productId":"***",
      "subscriptionGroupIdentifier":"***",
      "purchaseDate":***,
      "originalPurchaseDate":***,
      "expiresDate":***,
      "quantity":1,
      "type":"Auto-Renewable Subscription",
      "inAppOwnershipType":"PURCHASED",
      "signedDate":***,
      "environment":"Sandbox"
   }

[andikaputrarll]

@quentinNpApnl in my case i use uuid format like this 6d6bcf8f-30b8-4621-bb3c-2bce0f4b48c6 , previously i just inputed random thing.
When use the uuid format appAccountToken was returned on server side.