Customize Azure B2C SMS throttling

Emmanuel Larrieux 26 Reputation points


I can't see any information on the documentation about the SMS throttling rules and how to alter them.

Currently when I select the "send new code" option I get "You hit the limit on the number of text messages. Try again shortly.​".

Is there a way to configure the amount of messages sent to a specific number in a period of time?


Microsoft Entra External ID
Microsoft Entra External ID
A modern identity solution for securing access to customer, citizen and partner-facing apps and services. It is the converged platform of Azure AD External Identities B2B and B2C. Replaces Azure Active Directory External Identities.
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  1. shital.lawhale 31 Reputation points

    Hi team, I am facing this issue of sms -limit. Can you please provide an update on documentation and also if we can see the number of attempts made.

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  2. AmanpreetSingh-MSFT 56,441 Reputation points

    Hi @Emmanuel Larrieux • Thank you for reaching out.

    The current B2C SMS throttling limit is 100 SMS codes per phone number in a day. As of now, this limit cannot be increased for a particular phone number only and if this limit is increased at the backend by the product team, it will be changed for all phone numbers, which may lead to security issues.

    If you are getting the error You hit the limit on the number of text messages. Try again shortly.​ before hitting 100 SMS codes/phone number/day limit, please open a support ticket to investigate if there is any issue specifically for your B2C tenant.

    PS: Our Docs team is already working on a document that will include this limit.


    Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

  3. SK 1 Reputation point

    We are still facing this issue both when send code right away and even during normal MFA sign-in. The error messages are very confusing. Is there any update on the documenation you mention?

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