2494005 - Clicking "Add Observers" button in user page jump to "Object Not Found" page

With Task Checklist enabled for a Other type item, and "User Can Request Observation" has already enabled, login as an end user who has been assigned with this item, go to his learning plan and click "Request Observation"> then click Add Observers, 

Then an "Object Not Found" page jumped out.

• Learning Management System (LMS)
• SuccessFactors BizX Suite

1/ Create a new "Other" type item, add some tasks to this item, open Task Checklist Settings, and tick "Enable Task Checklist" & "User Can Request Observation" on;

2/ Assign the item to one user;

3/ Login as this user, go check his learning plan, click "REQUEST OBSERVATION", then click "+ Add Observers" button;

4/ A "Object Not Found" page jumped out.

LMS required domains are not added to browser trust sites. 

Please add “https://*.plateau.com”, "https://*.successfactors.com" and "https://*.successfactors.eu" to your browser trusted sites,

For Internet Explorer this can be done in Tools> Internet Options>Security> Trusted sites> Sites.

For instances hosted in Preview datacenters we need to add "https://*.sapsf.com" and "https://*.sapsf.eu" to the list of trusted sites.

For DC15 instances  we need to add "https://*.sapsf.cn" to the list of trusted sites.

After done, clear your browser cache and retry, the user search pop-up will display with no issue.

https://launchpad.support.sap.com/#/notes/2310570 

Add Observers, Object Not Found, error 404, trusted sites, task, checklist , KBA , LOD-SF-LMS-ADM , System Admin, Global Variables, References , Problem