OAuth 2 Client Credentials failing while configuring Streaming Destination in AEP (Authentication failed)

Hello ​@user48 

It seems like you are trying to connect AEP as a destination to AEP, while I can understand that some usecases would need such creative workarounds, but it would end up being an abuse of the system, if not done with diligent care. Hence it may also be possible that Adobe restricts this by design. Just an asuumption.

Nevertheless, regarding the question here, the grant type is included by default and you might like to choose Basic authentication, the header already includes the grant Type. Refer https://experienceleague.adobe.com/en/docs/experience-platform/destinations/catalog/streaming/http-destination#supported-authentication-types:~:text=OAuth%202.0%20client%20credentials%20with%20basic%20authorization%2C%20with%20an%20authorization%20header%20which%20contains%20URL%2Dencoded%20client%20ID%20and%20client%20secret.

Hence the option 3, that you’ve tried should have worked. Since it didn’t, I was making the earlier assumption. 

Have you tried the basic webhook testing in lower environments for the configuration or even on Postman, if the credentials work.
I have no working example of this specific AEP - AEP setup, hence cannot share more here.

Hi ​@user48,

not sure your URL is correct, my postman repo uses /v2 in the URL, and I have “session” in my scopes as well.

https://ims-na1.adobelogin.com/ims/token/v2?grant_type=client_credentials&client_id={{API_KEY}}&client_secret={{CLIENT_SECRET}}&scope={{SCOPES}}

SCOPES: openid,session,AdobeID,read_organizations,additional_info.projectedProductContext

Have you tried doing a separate auth request within Postman and your credentials?

Hi ​@user48!

The issue that you seem to be running into is because you are trying to send an auth request to Adobe’s own API Token URL. Generally, HTTPs API Destinations are used for third party HTTP endpoints hosted on Azure, GCP, or AWS. So in the “Access Token URL” would be where you put a third party/custom endpoint. Here’s a screenshot of the prerequisites for this type of destination:

What were your goals for setting up this endpoint? Maybe I can point you to a different resource that can help you do what you want to do.