Error connecting to the workflow manager: Nintex Workflow designer for O365

Cause

Workflow Service Store feature is not activated by default.

Resolution

To resolve this issue,we need the activate the feature  using the url   _layouts/15/WorkflowServiceHealth.aspx. 

SharePoint - User Information List

The people picker gets/picks information from multiple locations:

– The User Information List

– Active Directory

The User Profile Service Application syncs information from the AD and updates the User Information List.This Sync

 does not delete the user from the list.

User Information List is hidden List.

It can be viewed via the browser by navigating to below urls

1.<Site URL>/_catalogs/users/simple.aspx

2. <Site URL>/_catalogs/users/detail.aspx 

3.To delete the same open the below URL's

<Site URL>/_layouts/people.aspx?MembershipGroupId=0

or

<Site URL>/_layouts/15/people.aspx?MembershipGroupId=0

and click on “Actions –> Delete Users from Site Collection

4.To view Specific User

<Site URL>_layouts/userdisp.aspx?Force=True&ID=idofUserInUserInfoList

5.Orphande users will cause problem