Clinical login OTP systems require secure email fallback when SMS fails

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Technical guidance recommends using email as a fallback authentication method when SMS delivery fails for clinical report portals. The system should offer magic links for same-device users and typed codes for cross-device scenarios after a defined retry window. All authentication challenges must include secure token generation, hashed storage, strict expiry limits, and one-time consumption controls. Clinical reports should only be delivered through established product channels after successful authentication, not attached to login messages.

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