Hi Folks,
I am trying to utilize my IDM4.5 integrated OSP for Access Review as well.
Let me give a brief idea about my environment setup:
1) Access review on a separate box and OSP along with User Application on an another box. (AR 1.5 & User Application is of IDM4.5, OSP is Latest)
2) Communication is fine among the boxes stated above.
3) After placing uaconfig-ar-defs.xml on OSP server I configured the details of Access Review SSO Client as well. (I followed section 11.3 of access-review-user.pdf Guide).

After all configurations are done. I restarted both the servers &I found below error while accessing: https://%ar-serverDNS%:8443/

Error: The service can be disabled, or there was an invalid request for active service. Contact your system administrator. (Received an invalid OAuth2 request).

Kindly help here.