Unauthorized client in Azure AD B2C - Stack Overflow

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I have created a webapp using app registration where the webapp url is given as ";. I have created a simple user flow. There is no code or any other development language is used. I think, I'm missing some permission during app registration. I'm testing the B2C user "signupandsignin" flow.

However, I'm getting Error: "Unauthorized client"

AADB2C90057: The provided application is not configured to allow the 'OAuth' Implicit flow.
Correlation ID: 6495ddcf-4ba2-4f88-a7c3-de97a6c6f7b0
Timestamp: 2025-03-22 09:52:40Z

I have enabled "Access tokens (used for implicit flows)" and "ID tokens (used for implicit and hybrid flows)" during the app registration.

I have created a webapp using app registration where the webapp url is given as "https://jwt.ms". I have created a simple user flow. There is no code or any other development language is used. I think, I'm missing some permission during app registration. I'm testing the B2C user "signupandsignin" flow.

However, I'm getting Error: "Unauthorized client"

AADB2C90057: The provided application is not configured to allow the 'OAuth' Implicit flow.
Correlation ID: 6495ddcf-4ba2-4f88-a7c3-de97a6c6f7b0
Timestamp: 2025-03-22 09:52:40Z

I have enabled "Access tokens (used for implicit flows)" and "ID tokens (used for implicit and hybrid flows)" during the app registration.

• azure-active-directory
• azure-ad-b2c

Share Improve this question Follow edited Mar 22 at 10:45 jonrsharpe 122k3030 gold badges268268 silver badges476476 bronze badges asked Mar 22 at 10:01 AskMeAskMe 2,5771313 gold badges6868 silver badges122122 bronze badges 2

• Can you provide the screenshot of Authentication tab? – Rukmini Commented Mar 24 at 3:34
• I tried the same in my environment, Authentication tab looks like this and when I ran the user flow I got the ID token successfully without any error. Make sure to select the correct application while running the user flow. – Rukmini Commented Mar 24 at 7:13

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Sorted by: Reset to default 1

The error "The provided application is not configured to allow the 'OAuth' Implicit flow." usually occurs if the Azure AD B2C application is not enabled with Implicit grant and hybrid flows.

Hence to resolve the issue make sure to enable Access and ID tokens in the Authentication tab:

Created a sign up and sign in flow and select the above application:

https://rukk33.b2clogin/rukk33.onmicrosoft/oauth2/v2.0/authorize?p=B2C_1_RukSUSIflow&client_id=ClientID&nonce=defaultNonce&redirect_uri=https%3A%2F%2Fjwt.ms&scope=openid&response_type=id_token&prompt=login

When I signed in got the ID token successfully:

If still you are facing the error, make sure you are choosing the right application while executing the user flow.

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