I have seen this as a solution in one of the topic:
Scopes are contained on an access token after a user account grants authorization to an application. It appears that you are calling the Customers endpoint in production which requires an access token with the ManageCustomers scope. This is a private scope that cannot be activated in our production environment until you’ve received our approval to use it and have entered into an agreement with us. Please contact a sales representative1 to find a package that best meets your needs!
But I don't know how to activate the ManageCustomers scope.
Can you please guide me in Production Environment.
Here are my details:
Here is the error:
"message": "Missing or invalid scopes for requested endpoint."