Please refer my previous article to learn more about creating NINTEX workflow in SharePoint 2013 Online.
In this blog you will see how to remove user from group using NINTEX workflow in SharePoint 2013 Online.
We will be removing the user from SharePoint group by calling the web service _vti_bin/usergroup.asmx. I have created a list which contains Name – Single line of text,UserLoginName – People picker and Comments – Multi line of text field.
Web Request Action:
Set Field in Current Item Action:
The specified user is removed successfully from the specified SharePoint group.