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Assign the users current or future email to an identity. This email will be used as the first data point to automatically group accounts from different services into a single identity.
If you have your email provider integrated already, you can also create their email account at the same time.
If you need specific information that you don't yet have (like phone number or github username) you can create "pending accounts" that don't yet have all the necessary fields.
Then create a sharable link to gather that data from the end-user.