AzureAD B2C Free Tier Rate Limit

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AzureAD B2C Free Tier Rate Limit

Meenakshi Vattanavar 25

For a free tier plan - What is the maximum requests per IP per Azure AD B2C tenant by default? What is the maximum requests per Azure AD B2C tenant per minute by default? What is the maximum requests per Azure AD B2C tenant per sec by default? Is there any request limit per client id in azure ? What are any other criteria's for calculating rate limit ? What kind of requests are included while counting the rate limit ? What if we want to change the rate limit then how can it be done ?

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Akshay-MSFT 17,961 Microsoft Employee Moderator

@Meenakshi Vattanavar Thank you for posting your query on Microsoft Q&A. PFB answer for your queries:

What is the maximum requests per IP per Azure AD B2C tenant by default? 6,000/5min
What is the maximum requests per Azure AD B2C tenant per minute by default? 1200/min
What is the maximum requests per Azure AD B2C tenant per sec by default? 200/sec
Is there any request limit per client id in azure ? The cost of POST, PATCH, and DELETE operations on the applications request path depends on the signInAudience type. For apps where the signInAudience is AzureADMyOrg or AzureADMultipleOrgs, the cost is 70,000 requests per 5 minutes; while for apps where the signInAudience is AzureADandPersonalMicrosoftAccount or PersonalMicrosoftAccount, the cost is 60 requests per minute.
What are any other criteria's for calculating rate limit ? For B2C: Tokens/sec = 200/requests-consumed
What kind of requests are included while counting the rate limit ? These could be found Azure Active Directory B2C service limits and restrictions
What if we want to change the rate limit then how can it be done ? No these cannot be changed as these are calculated as per license https://azure.microsoft.com/en-us/pricing/details/active-directory/external-identities/

Thanks, Akshay Kaushik

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Meenakshi Vattanavar 25 Reputation points

2023-04-05T03:03:56.3766667+00:00
@Akshay-MSFT Thank you for quick reply.

We are seeing some throttling issues during performance test before we hit rate limits as you described. Is there a way to completely understand internal throttling algorithm used in our case ?

Where can I find the sign in audience type?

Does it apply to Azure AD B2C tenant as well ?

What is the definition of requests ? Is it just the /token or does it include /authorize, /openid-configuration, /logout....like any requests to b2c ?
Akshay-MSFT 17,961 Reputation points Microsoft Employee Moderator

2023-04-05T04:19:49.0033333+00:00
@Meenakshi Vattanavar

We are seeing some throttling issues during performance test before we hit rate limits as you described. Is there a way to completely understand internal throttling algorithm used in our case ? As per Throttling limits relevant to testing the following global Microsoft Graph throttling limits apply:

Where can I find the sign in audience type? It is defined within the application registration:

Does it apply to Azure AD B2C tenant as well ? Throttling limit applies to all the resources within that tenant

What is the definition of requests ? Is it just the /token or does it include /authorize, /openid-configuration, /logout....like any requests to b2c ? It applies to any confirmed in 1st point. Also for types of request coming from B2C kindly visit https://learn.microsoft.com/en-us/azure/active-directory-b2c/service-limits?pivots=b2c-custom-policy

Thanks, Akshay Kaushik
Meenakshi Vattanavar 25 Reputation points

2023-04-06T03:11:18.1133333+00:00

@Akshay-MSFT Thanks for the reply. During performance testing We are seeing throttling 429 error(Too many requests) for min rate of 240 per minute to max 450 per minute requests rate limit. These requests include different requests. We tried using single IP or multiple IP's. Example - Using local IP to initiate requests (without VPN) - 450 users - It fails in 2 mins of the test , 450 per min rate Also with VPN tested some different IP's starts failing in 8 mins with min rate limit of 240 approx. We checked there are no internal firewalls impacting this. Any suggestion on how we can troubleshoot such scenarios. ?Is there any graph which we can view which shows the current rate limit we have reached ?
Meenakshi Vattanavar 25 Reputation points

2023-04-06T14:36:03.78+00:00

@Akshay-MSFT Can you please check my question above?
Akshay-MSFT 17,961 Reputation points Microsoft Employee Moderator

2023-04-12T07:22:05.21+00:00

@Meenakshi Vattanavar In that scenario I would recommend to raise a support case to validate the number of request hitting the tenant.

Thanks, Akshay Kaushik

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AzureAD B2C Free Tier Rate Limit

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