Send either a login or signup email OTP to a Member. A new, pending, or invited Member will receive a signup email OTP. Non-active members will have a pending status until they successfully authenticate. An active Member will receive a login email OTP.
The OTP is valid for 10 minutes. Only the most recently sent OTP is valid: when an OTP is sent, all OTPs previously sent to the same email address are invalidated, even if unused or unexpired.