Google Play Error retrieving SKU details

I am using Ionic3 with Ionic Native In App Purchases. I set up a number of in-app purchases on the Google Play Store.

It was working perfectly and I could view all the products with:

.getProducts(this.PRODUCT_IDS)

, until I added a test user. Now I am getting this error:

Error retrieving SKU details

after I tried to make a purchase with the test user.

this.iap.buy(item.productId).then((data) => {
  return this.iap.consume(data.productType, data.receipt, data.signature);
}).then(() => {
  console.log('product was successfully consumed!');

And now I cannot access the products any longer.

I have read here that the reason may be because testers cannot consume a product and offers this solution:

SOLUTION:
Pull up “orders” on the Play Console and “cancel” the pending purchase.

However, then I have two questions:

  1. How do you test purchases, if a tester cannot consume a product?
  2. Where do you pull up orders on the Play Console? I do look at “Order Management”, but there are no orders listed.

Thanks