Invalid OAuth response from oidc.


This Content is from Stack Overflow. Question asked by Siddharth

I am trying to add Azure B2C as on OIDC provider for Firebase Auth. The implicit flow works fine but the code flow fails with either of the following errors :

Malformed response cannot be parsed from oidc.<provider_name> for CODE_EXCHANGE


Invalid OAuth response from oidc.<provider_name>

On investigation I found that the last call where this failure happens is this :

curl --location --request POST '<web_key>' 
--header 'Content-Type: text/plain' 
--data-raw '{
    "returnSecureToken" : true,
    "requestUri" : "https://<firebase_project_name><state_goes_here>&code=<authcode_flow_code>",
    "postBody" : "providerId=oidc.<provider_name>",
    "sessionId" : "<random_session_id>",
    "autoCreate" : true,
    "returnIdpCredential" : true

Response for this request comes as :

    "error": {
        "code": 400,
        "message": "INVALID_IDP_RESPONSE : Invalid OAuth response from oidc.<provider_name>",
        "errors": [
                "message": "INVALID_IDP_RESPONSE : Invalid OAuth response from oidc.<provider_name>",
                "domain": "global",
                "reason": "invalid"

I tried checking Firebase logs but helpful information available. However, I did noticed that Firebase exchanged this code for the id_token successfully before failing and returning 400 error.

Any help in this regard?


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