If you're using the Triggered Send Email REST API, there might be issues where your API package is mis-configured for email sending. If your permissions aren't configured correctly, the REST API for email triggered sends will fail to function. You might see an API response of 403 - Insufficient Privileges error.
More information on Marketing Cloud API packages and permissions:
If you are experiencing this error, please confirm and modify your API package permissions as follows:
Follow this link for more information on Marketing Cloud API package configuration.
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