Dan Rios • 12/1/2025

Rate limiting Entra External ID Email OTP Events with APIM

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This article details how to enforce rate limiting on Entra External ID's custom email OTP API endpoint using Azure API Management (APIM). It addresses challenges like user abuse and Microsoft-originating IPs by using the `rate-limit-by-key` policy with the user's email identifier from the OTP payload as the custom counter key.

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#Rate Limiting #Azure #Otp
Rate limiting Entra External ID Email OTP Events with APIM

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