Hello!
While "scopes" grants access for users to programmatically interact with various datapoints within your DrChrono account, you must configure user-based "permissions" to allow access to your "scope" options. The most common fix for your specific issue is to visit "Account" > "Staff Permissions" then locate your API-connected user and click "View" to access the permissions modal. In the modal, locate the permission "Access Scheduling" and ensure the checkbox is "checked" then save your changes.
Let me know if that works for you.
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Aaron Bethea | DrChrono ETL Migrations / API Specialist
EverHealth