Which of the following columns is not supported in automations?

When considering which column type is not supported in automations within the Monday.com platform, it is crucial to understand how different column types interact with automation features. Phone columns are primarily designed to store contact numbers, serving a specific purpose without having an actionable item associated with them.

In automations, the focus is on leveraging data to trigger actions, such as moving items, changing statuses, or notifying team members based on specific conditions. While the other options—Tags, Dropdown, and Dependency—can be utilized within automations to facilitate various workflows or management processes, a Phone column does not provide a standardized value or selection that can be manipulated or used as a trigger for an automation rule.

Tags allow for categorization of items, Dropdown columns enable specific choices to be made, and Dependency columns help in managing tasks linked through relationships. Each of these can affect the workflow, making them very useful for setting up automation rules. However, the Phone column lacks this functionality, which is why it does not support automations.