I have same problem. Installed the repositories, as shown in the attached pictures..
I used the example code found here. Following latest tutorial I obtained Google developer key, put it in the manifest, modified the Manifest, read all posts related to this subject.
Nevertheless "Maven artifact not found: com.google.android.gms/play-services-map" still happens...
Attach screen-shot and project. Developer key is modified just not to show it publicly.
Of course I miss something, but it is not easy to find it, at this point. Perhaps something related to how Android is installed (I mean the folders where libraries are stored etc.? Normally I follow defaults, and I just have one disk on this computer..)
Any indications?
Thanks in advance.