No discount applied only checkout through Manifold Campaign Widget

Manifold Support Questions
1

Hi guys!

We are going to use the Manifold Campaign Widget for distributing merch.

I embedded m-campaign widget using following snippet:

  <head>
    <script src="https://connect.manifoldxyz.dev/latest/connect.umd.min.js"></script>
    <link rel="stylesheet" href="https://connect.manifoldxyz.dev/latest/connect.css">
    <script src="https://campaign.manifoldxyz.dev/latest/campaign.umd.min.js"></script>
    <link rel="stylesheet" href="https://campaign.manifoldxyz.dev/latest/campaign.css">
  </head>
(snip)
      <div
        data-widget="m-connect"
        data-grant-type="signature"
        data-client-id="ClientID that created on developer portal"
        data-app-name="App Name of app created on developer potal"
      ></div>
      <div
        data-widget="m-campaign"
        data-grant-type="signature"
        data-client-id="ClientID that created on developer portal"
        data-app-name="App Name of app created on developer potal"
        data-campaign-id="ID that displayed on Product Gate"
        data-network="1"
      ></div>

Then the user is able to connect wallets and claim a product.
#1: connect wallet
#2: click claim button
#3: popup eligible tokens
#4: click claim button beside a token
#5: click submit
#6: click checkout
However no discount applied to the price on shopify checkout page.

image
image2322×1208 149 KB

When using shopify storefront(that is using Merch bridge theme), discount is applied.

image
image756×248 29.7 KB

So we believe there is a problem with the campaign widget configuration.
App settings are:

Grant Type: Signature Grant
App Name: the **** part of ****.myshopify.com
Redirect URI: Shopify shop url(it is custom domain, without trailing slash)

Developer Portal Account is linked on Shopify admin(Apps > Manifold > Developers).

I tried uninstall and reinstall Manifold app, but the result was the same.

Are there any parameters to check?

Thank you.