Ensure to provide the correct Shared Secret in the Qonversion Dashboard.
Check that your service account registered in the Google Play Console has the necessary account permissions for Qonversion:
View financial data
Manage orders and subscriptions
Pub/Sub Admin (required for Google Real-Time Notifications)
Open the In-app products or Subscription tab respectively in the Google Play Console and make some updates. For example, edit the product description and save it. It will update Google’s cache.
Ensure you've configured and provided the correct Google Play Service Account Key by the following documentation.