Problème autorisation données de localisation


I have a Oneplus Nord (avicii) with e/OS 1.14. Everything works perfectly, except for one application.

Since switching to Android S (e/OS 1.12), I have a problem with the application called “Bluetens”. It’s an electrostimulation app that uses a Bluetooth device. Previously, everything worked fine, but now it’s impossible to grant “authorization to access location data” (in French). Localization is enabled (as is blutetooth) and I have authorized the localization of nearby devices.
However, in the location settings, the application doesn’t appear and it’s not possible to authorize it…

Any ideas?

Best regards