An associate is tasked with setting up an email broadcast using a Single Send journey...

If an associate is unable to find a specific data extension when setting up an email broadcast using a Single Send Journey in Journey Builder, the first troubleshooting step is to ensure that the data extension is configured as sendable. A sendable data extension is one that has been set up with a clear relationship to a subscriber or contact record, allowing it to be used as an entry source for sending emails.

This setup includes specifying a field in the data extension that relates to the subscriber key or contact key in Marketing Cloud, enabling the platform to link each record in the data extension to an individual subscriber or contact for email sends.