[Digital Goods] unsupported context error

Hello,

I followed the Digital Goods instructions, but I'm encountering an "unsupported context" error on the following line:
```

this.service = await window.getDigitalGoodsService(
  'https://store.microsoft.com/billing'
);
```

I'm testing this by opening the published app in the store. I can’t test it locally because the origin trial has expired. What should I do?

Thanks!