Don't understand this error

Tim Anderson 85 Reputation points
2025-05-01T20:43:42.9433333+00:00

We have paid support, and are setting up Azure B2C for auth on a React Web App. We are getting this auth error now from our b2c auth:

ServerError: server_error: AADB2C90075: There was a problem processing your request. Please try again.

Correlation ID: e95d1ae5-92af-403e-a28f-079a68ce5dfe

Timestamp: 2025-05-01 20:33:01Z

at js (Authorize.ts:378:15)

at Ps (Authorize.ts:294:5)

at e.<anonymous> (InteractionHandler.ts:68:32)

at u (runtime.js:63:40)

at Generator._invoke (runtime.js:294:22)

at Generator.next (runtime.js:119:21)

at n (asyncToGenerator.js:3:20)

at o (asyncToGenerator.js:25:9)

at asyncToGenerator.js:32:7

at new Promise (<anonymous>)  

it was working fine - unsure why this started happening.

When i look up the error I get this:

AADB2C90075 The claims exchange '{0}' specified in step '{1}' returned HTTP error response with Code '{2}' and Reason '{3}'.
AADB2C90075 The claims exchange '{0}' specified in step '{1}' returned HTTP error response with Code '{2}' and Reason '{3}'.

Which is not the most helpful explanation. What does it mean?

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.
3,162 questions
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Accepted answer
  1. Raja Pothuraju 21,695 Reputation points Microsoft External Staff
    2025-05-06T00:08:10.7+00:00

    Hello @Tim Anderson,

    Based on the behavior observed in the flow, it appears to be an API-related issue. I recommend checking the Azure AD B2C audit logs to identify any failures associated with API calls.

    If you find any entries indicating an API failure, the next step would be to review API insights to determine the root cause of the failure on the API side.

    1 person found this answer helpful.

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