First of all this one seems not exactly easy or straight forward, but if you are interested this person has a way to restore Lightroom 6 Map module functionality. As you may be aware, due to a Google Maps change, Adobe changed the Lightroom maps module interface to accommodate the Google changes. Adobe did not retrofit the update to Lightroom 6 and earlier versions so the Map module no longer works in those versions. Restoring the functionality does not appear to be for the faint of heart, but this guy seems to have figured it out.
https://www.dpreview.com/forums/thread/4350044
If you try this and it works report back here.
Alan Hunt