Issue
In an instance where there are multiple workspaces, when creating a new email and right-clicking on a Marketo Starter Template to send a sample email, an error is displayed: Access Denied
This error occurs even though the user has all permissions to Access Design Studio and all permissions to Access Marketing Activities. This includes the 'Run Single Flow Action' permission which is required for sending sample emails:
"You must have the Access Database - Run Single Flow Actions permission to send sample emails."
https://docs.marketo.com/display/public/DOCS/Send+a+Sample+Email
Solution
This error can occur if the user does not have access to the Default workspace. To solve this, the user must be provided with access to the Default workspace in [Admin > Users & Roles]
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