- Edited
XL87LGV7W9EY7Y7A5Z9B3T7N6ZRX74 which was installed first the merlin or the play services? If the former, uninstall it and reinstall as the Play Services are detected by apps on first use.
If the latter did you install using the Play Store app page in the Apps app? If not and you only installed either Play Services or GSF or both uninstall ALL and start again using the Play Store page to install all 3 required components.
You shouldn't need to give any of the Play Services components location permission as all location requests are by default routed to the OS API reliant on just GPS and not a network location service.
To get a lock you will then need a direct line of sight to the sky or even better be stood outdoors between 2-5 minutes for first lock while additional satellite data is downloaded.
You can also validate the device and OS are able to get a lock using https://play.google.com/store/apps/details?id=com.android.gpstest