Accessing Auth Token Destination Error: Failed to read authentication token.

[#1]

Using CAP and SAP Cloud SDK to retrieve a destination of OAuth2SAMLBearerAssertion type.

We are currently using the following destination config:

In our CAP application, we are trying to access the destination using:

DestinationAccessor.getDestination(Constants.DEFAULT_S4_HANA_CLOUD);

However when we get the following error:

Failed to read authentication token. The destination service responded with an error: Retrieval of OAuthToken failed due to: Cannot determine user to propagate for OAuth2SAMLBearerAssertion destination. Either provide user_token JWT token (https://docs.cloudfoundry.org/api/uaa/version/4.7.1/index.html#user-token-grant) when retrieving the destination or configure it with SystemUser.

How can this be possible if I am able to get the token via the following?

AuthToken currentToken = AuthTokenAccessor.getCurrentToken();
AuthToken xsuaaServiceToken = AuthTokenAccessor.getXsuaaServiceToken();

I have also tried to authenticate with the token passed i.e.

AuthTokenAccessor.executeWithAuthToken(currentToken,  () -> DestinationAccessor.getDestination(Constants.DEFAULT_S4_HANA_CLOUD));

Are we missing a crucial step in the process? Has anyone encountered this issue before?

How are we able to correctly pass the AuthToken to the destination?

Thanks in Advance!

[quovadis · Accepted solution]

Here you go Erlo,

https://blogs.sap.com/2021/03/24/oauth2samlbearerassertion-flow-with-the-sap-btp-destination-service...

kind regards; Piotr

[PrasanthPadmanabhan]

Hi Erlo,

You can refer to the document https://help.sap.com/docs/CP_CONNECTIVITY/cca91383641e40ffbe03bdc78f00f681/6e5e004b6553403486a03da53... and the blog https://blogs.sap.com/2021/05/10/oauth2samlbearerassertion-flow-with-the-sap-btp-destination-service..., which explains this ins detail

Thanks and Regards,

Prasanth

[former_member723422]

Hi Prasanth,

Thank you for your quick response. We have already configured this in our current BTP subaccount and S4HC (I'll double-check that this is the case). I think the problem lies in the Java/Cloud SDK setup since this is where we are getting the access issue.

Erlo

[PrasanthPadmanabhan]

Hi Erlo,

Additionally, you can refer to this reply in the blog that I've shared. https://blogs.sap.com/2021/03/24/oauth2samlbearerassertion-flow-with-the-sap-btp-destination-service.... A solution for a similar problem you are facing is shared here.

Best Regards,

Prasanth