Create a new tag in a Data Room. The tag name is trimmed and must be non-empty and at most 64 characters. Tag names are unique within a Data Room and matched case-insensitively: creating a tag whose name only differs in casing or surrounding whitespace from an existing tag responds with 409. Deleted tags do not reserve their name.

The response returns the created tag, including its generated ID. Use that ID to assign the tag to participants via the Set user tags endpoint.