Microsoft Entra External ID

Deployment External Operations

In brief

Learn about edge protection, domains, subscriptions, consumer app security, and fraud tactics in security operations for Microsoft Entra External ID.

Documentation change

description: Learn about edge protection, domains, subscriptions, consumer app security, and fraud tactics in security operations for Microsoft Entra External ID. ms.service: entra-external-id ms.topic: concept-article

ms.date: 11/11/2025

ms.date: 06/27/2026

ms.reviewer: gasinh

#customer intent: I need to understand subscriptions and billing, consumer app security, and how to prevent fraud tactics in Microsoft Entra External ID. |Reputation email filtering|To mitigate the risk of fraudulent email accounts, implement domain validation. Restrict sign-up from email addresses with poor reputations, or known associations with malicious activity. Microsoft Entra External ID supports custom extensions during sign-up. To evaluate the reputation of the email domain, invoke a REST API during the sign-up flow. Based on the reputation score, the system allows or blocks the sign-up request.| |IP email filtering|To reduce the risk of fraudulent account creation, we advise you to restrict sign-ups from anonymous proxies or IP addresses tied to Autonomous System Numbers (ASNs) outside your organization's business regions. This strategy helps reduce exposure to high-risk or untrusted traffic sources.
Microsoft Entra External ID supports custom authentication extensions to invoke during the sign-up process. Use these extensions to call a REST API to assess the reputation or geolocation of the IP address initiating the sign-up request. Use this process during email one-time password (OTP) verification.| |Excessive OTPs from one IP address or ASN|Implement monitoring and alerting when a high volume of email OTP requests originates from the same IP address, ASN, or location. For example, trigger an alert if email OTPs come from a single IP or similar geo-coordinates in a short time.|

|Sign-up protection (Security Store)|Use Microsoft-built native integrations with Arkose Labs and HUMAN Security to detect and block bot-driven sign-ups and fake account creation. Configured through the Microsoft Security Store in the Microsoft Entra admin center.|

To strengthen defenses, Microsoft Entra External ID has a premium fraud prevention feature with industry-leading non-Microsoft fraud protection providers, such as Arkose Labs provider, for advanced bot and HUMAN to help prevent fake account registrations during user sign-up. These providers deliver comprehensive fraud detection and mitigation capabilities and enable organizations to detect and block automated threats, including bot-driven sign-ups, throughout the registration process.

To strengthen defenses, Microsoft Entra External ID integrates with industry-leading non-Microsoft fraud protection providers through the Microsoft Security Store. Native, Microsoft-built integrations are available for Arkose Labs and HUMAN Security, which deliver comprehensive bot detection and fake-account-prevention capabilities during the sign-up flow. For configuration steps, see Integrate Microsoft Entra External ID with Arkose Labs and HUMAN Security for fraud protection.

For native authentication API flows, see Tutorial: Integrate third-party bot protection with Native API sign-up flows.

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