FWIW, on my last sailing, the map was never updated/working - however, it was an uncommon itinerary and/or it may have just been an isolated incident? However, the map for my upcoming sailing is functional, but it is a very common itinerary which leads me to believe the first uncommon itinerary was not worth the effort for Disney to generate and upload, but that is just IMO FWIW.
However, to answer your question one way to access the map I believe you are referring to is to log into your
DCL account, then choose the reservation of the sailing you are trying to find the map of (this only applies if you have multiple reservations, otherwise I think it defaults to the only one you have - however, I don’t know this for sure and could be incorrect), regardless next click on “Cruise Details”, then scroll a good deal down the page past all the Dining, Special Requests, etc, and it should be just below the Special Services under Ports of Call. Let the graphic go through the sailing path and it will end on a map displaying the entire sailing. This is how it works for me, but YMMV - as it did for me on my latest sailing.
Hope this helps!
ETA: I think I answered your question? If not, sorry!