Ah, looks like there was an extra "/api" on the URL - https://pr-oba.live/
is the version that needs to be in the server directory.
Ok, I've tested this in the staging Regions API that we have and it works fine, so I pushed the content to the production Regions API. You should see this change within the next hour at http://regions.onebusaway.org/regions-v3.json
. When you see Mayaguez there, if you uninstall/reinstall the apps they should include Mayaguez as an experimental region. In OBA Android, you need to enable these by checking the box for "Settings->Advanced->Experimental servers", and then it will show in the list of regions.
Please give it a shot and let me know if it works!