User does not have the privilege to act on behalf another user error while using impersonation in Web API in Dynamics 365.

We might receive below error while using impersonation in Web API call.

{\r\n  \”error\”:{\r\n    \”code\”:\”\”,\”message\”:\”User does not have the privilege to act on behalf another user.\”,\”innererror\”:{\r\n      \”message\”:\”User does not have the privilege to act on behalf another user.\”,\”type\”:

Impersonation in Web API

http://www.inogic.com/blog/2016/02/impersonation-available-using-web-api-in-dynamics-crm-2016/

This error can occur in a scenario when User A is trying to impersonate User B, but user A doesn’t have “Act on Behalf of Another User” privilege.

Below article nicely explains it

https://community.dynamics.com/crm/b/magnetismsolutionscrmblog/archive/2013/07/18/act-on-behalf-of-another-user

Hope it helps..