users.discoverableContacts.lookup method
Usage info
The features within are only available to Slack workspaces on Enterprise Grid plans.
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This API method only returns info on whether there is a discoverable Slack user associated with an email address. No other information about the user is returned.
Both users and organizations can opt out of Slack Connect discoverability. See the help center for more instruction.
Use this method when you want to only verify email addresses, or when you want to limit the exposure of user information.
If you do want to return the user's information, use the
users.lookupByEmail method to return the user object.