impersonation working only for some users

Hi

I implemented Sugar Identity in Sugar 14, for some users impersonation is working , for some are not

like this active user is working 

https://console-us-west-2.service.sugarcrm.com/api/impersonate/form?name=srn:cloud:iam::2548488229:user:501b5fde-794c-11e9-967d-0a1db36945e2

But this active user is not working 

https://console-us-west-2.service.sugarcrm.com/api/impersonate/form?name=srn:cloud:iam::2548488229:user:0a196ebe-225e-11ec-ab83-0a1db36945e2

and giving  error 

"Unauthorized: We're sorry, but it appears you are unauthorized to access this resource."



Nothing of the below conditions satisfy the criteria of User impersonation

1. Whether the user is an administrator or a regular 

2. Whether the license is Sugar Enterprise / Sugar Automate or both

3. Whether the user management role is checked or not 

4. Whether The user Sugar identity Management Role is assigned to a user or Not 

 

I went through docs and tried Following, but in every case some users are impersonating, some are not  

 

1. set only  Global and Admin Roles to the user

2. impersonate the user only created by the administrator

3. set a regular user to administrator and vice versa

4. Enable/disable user management role 

5. Link/unlink Sugar Identity management Role to the user

6. Change the job title, Save, and verify the change in the user's table. 

Then using Incognito mode, I  logged into Sugar navigated to Admin > Sugar Identity, and then attempted to impersonate again.