InAppPurchase2 order error

Hi all,
I integreted InAppurchase 2 plugin on my ionic 5 app.

constructor(
    private platform: Platform,
    private inAppPurchase: InAppPurchase2
  ) {

    this.platform.ready().then(() => {

      console.debug("InApp Purchase Regisration")
      this.inAppPurchase.DEBUG;
      this.refreshAppProducts();

    });

  }

  private refreshAppProducts() {
    this.productIDs.forEach(productId => {

      console.debug("In App Product Registration: " + productId)
      this.inAppPurchase.register({
        id: productId,
        type: this.inAppPurchase.NON_CONSUMABLE,
        alias: productId
      });

      this.subscribeNotifications(productId);

    });
    this.inAppPurchase.refresh(); 
  }

  public order(productId) {
    this.inAppPurchase.order(productId);
  }

  private subscribeNotifications(productId) {

    this.inAppPurchase.when(productId).registered((product: IAPProduct) => {
      console.log('Registered: ' + JSON.stringify(product));
      alert ('Registered: ' + JSON.stringify(product));
    });

    // Updated
    this.inAppPurchase.when(productId).updated((product: IAPProduct) => {
      console.log('Updated' + JSON.stringify(product));
    });

    // User closed the native purchase dialog
    this.inAppPurchase.when(productId).cancelled((product) => {
      console.error('Purchase was Cancelled');
      alert('Purchase was Cancelled');
    });

    // Track all store errors
    this.inAppPurchase.error((err) => {
      console.error('Store Error ' + JSON.stringify(err));
      alert ('Store Error ' + JSON.stringify(err));
    });

  }

After initialization, when I try to open order, the error handler is triggered and I receive this error:

Store Error {"code":6777003... 

I tried on real android device using this command:

ionic cordova run android --device -l -c --debug

I already created product on my android google console.

Help me please

Luca