Hi Rahul,
As per your error it means that your content server is returning 401 error mesaage for the store http request coming from SAP.
Try with below points
1, Check Content repository authorization in Opentext archive Server ( Admin Client)
2. Admin Client on your Archive Server and expand Archives, select the correct archive, then go to the Certificates tab. Make sure the certificate from SAP is enabled.
3. SAPHTTP and SAPCMS RFCs from SM59 are okay?
Br, Vaibhav