Hey @Fateh ,
From my previous experiences, this error can occur if your app is trying to use an access scope that the Store did not explicitly approve on install. This can happen if you add new functionality that require new access scopes to your app, but did not re-install the app on the Shopify Store.
Try re-installing the app and making sure that all access scopes are being approved, and hopefully that should resolve the error
Hassain | Developer Support Specialist @ Shopify
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