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It seems like the authentication token you are using is not authorized to access the Account API endpoint. The fact that you are able to authenticate against workspace endpoints using the same token suggests that the issue is specific to the Account API.

Here are a few steps you can try to troubleshoot the issue:

1. Make sure that your PAT token has the appropriate permissions to access the Account API. You can check this by going to the Databricks web interface and navigating to the "User Settings" > "Tokens" page. Check that the token has the "Manage" permission for the "Account Management API".
2. Check that the ACCOUNT_ID variable is set to the correct account ID. You can find this ID in the Databricks web interface by going to the "Admin Console" > "Account Settings" page.
3. Check that you are using the correct endpoint URL. The URL you are using in your code is correct for the public cloud instance of Databricks, but if you are using a Databricks deployment on a different cloud provider, the URL may be different. You can find the correct endpoint URL in the Databricks documentation for your cloud provider.
4. Check that the account admin role is correctly assigned to your user account. You can check this by going to the Databricks web interface and navigating to the "Admin Console" > "User Management" page. Check that your user account has the "Account Admin" role assigned to it.

Hope this helps!