Perhaps the doc was not up to date. the role you need to give is "CustomerServiceRepresentatives" to access to order management 

we have similar request to give read access to commerce pages => "Customers" & "Order Management". We add user from "Permissions to functions" but its not reflecting. You mentioned role CustomerServiceRepresentatives . Do we need do this programatically? 

No you don't have to do it programatically - you can, but you can just assign the role using admin UI 

then assign the users to that group

Hi

I Quan , thanks

I created a group "CustomerServiceRepresentatives" & assigned this group to my test user .

Now i see "Order Management" page has come under "Commerce"

But

All the default groups under any function in permissions for functions have dissappeared. It this normal behaviour? I just did this on integration but can test on local environment

regards

Nitin

I'm not quite sure about "All the default groups under any function in permissions for functions have dissappeared. " - can you add some screenshots to elaborate ?

adding CustomerServiceRepresentatives just shows "Order management" button in commerce user doesnt see any cart or order or subscription.

In our DXp and local environment i see alert (h.map is not a function)

Link to screenshot https://ibb.co/gz0bFF1

if you open the browser console, is there any error? anything in log? 

Yes, there are console errors in OrderManagement

Here is the link to screenshothttps://ibb.co/pL9vy1s

as you can see the file was blocked - sounds like something in your end (proxy/firewall maybe?), not related to the permission/access right settings 

I tested if this local error is due to firewall but i see exactly same console error even on integration environment.