# UserIdentifier

The entity to use to identify each user. Set this parameter to one of the following values:

- `PrincipalName`
- `Email`

The regular expressions that you specify for UserCantHaveRegex and UserMustHaveRegex should match values in the field identified by this parameter.

This parameter has no effect on ExplicitUsers.

Type: | String
Default: | PrincipalName
Required: | No
Configuration Section: | TaskName or FetchTasks
Example: | `UserIdentifier=Email`
See Also: | UserCantHaveRegex UserMustHaveRegex

_FT_HTML5_bannerTitle.htm