HR case agent needs toi see relevant knowledge articles for HR Service

[marcn]

I have seen this has been asked before but cant find a proper solution. 
so here it is again  - how to help HR case agent and provide him relevant knowledge articles during case handling in agent workplace ?
We have HR knowledge base populated with relevant categories and articles as a guideline for HR agents.

I was thinking use ML and make it work but no luck yet. 
This is mainly for HR case agent and not on employee portal for end users.

any pointers ??

[Ajay_Chavan]

Please verify the table configuration to ensure that the HR tables are active in the contextual search.

navigate to contextual search -> table configurations