Users must link an email address to a particular phone or device. No user must be able to register multiple devices linked to an email address.
| Aspect | Value |
|---|---|
| Source | New user |
| Stimulus | Trying to register in the platform |
| Environment | Production, normal conditions |
| Impacted Artifacts | Onboarding components |
| Respond | Identify a user with an email, and only accept one device per email address |