Is there a way to query work items where a user was mentioned? I am able to receive 'hard-coded' results by querying for
"History"-"Contains word"-"\@Username",
but I want a generic version, which works for all users. (Opposed to writing one query for every user)
There is no way to achieve this by work item query directly just as starain mentioned. You can create a custom hub or custom widget by using VSTS Extension to show these information in web portal.