The user should add and verify an email address in order to login as described here ».
auth.sentCodeTypeSetUpEmailRequired#a5491dea flags:# apple_signin_allowed:flags.0?true google_signin_allowed:flags.1?true = auth.SentCodeType;| Name | Type | Description | 
|---|---|---|
| flags | # | Flags, see TL conditional fields | 
| apple_signin_allowed | flags.0?true | Whether authorization through Apple ID is allowed | 
| google_signin_allowed | flags.1?true | Whether authorization through Google ID is allowed | 
How to register a user's phone to start using the API.