Hello Mohammed,
Sorry for the delay. Let me know if you've already identified the issue.
I suspect that there wasn't enough here for people to understand the scenario to respond to.
Please expand on your query.
* Providing steps and/or screenshots would help with our understanding.
* The product and version number.
* What is a "business unit?"
* How does your authentication chain work, or how do you anticipate it working?
* Has this worked in the past? What has changed?
* Test or production? Does the other one work?
The product is listed as "CA Service Desk" in the Category of this post, but CA Service Desk Manager does not have a product term called "Business Units.", You need to explain this context.
Thanks, Kyle_R.