New Subscription for 4.0 API?

We are attempting to transition from Aspose 1.1v api to 4.0 api but we are getting verification errors such as :
{"requestId":"xxxxxxx-xxxxxxx-xxxxxx","error":{"code":"accessRestricted","message":"**There is no active subscription for the customer** : 'xxxxxxxxx'.","description":"Operation Failed. A limit was hit.","dateTime":"2023-02-17T19:18:47.404204Z","innerError":null}}%

How do we go about remedying this?

@AGorman

Please send a private message with sample code and your credentials (Client ID and Secret). We will investigate the issue and guide you.