OAuth getAccessToken service error

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Hello All,

I am calling the OAuth getAccessToken service with POST method by passing grant_type=‘authorization_code’ and code ( the authorization code).

But, it fails with the below error:
[ISS.0086.9287] Applications cannot set the “WWW-Authenticate” field in the HTTP response header.
Caused by: com.wm.app.b2b.server.ServiceException: [ISS.0086.9287] Applications cannot set the “WWW-Authenticate” field in the HTTP response header.

I am working in 9.0 version.

Thanks,
Sathya