When first prompted tap Allow on the “App Would Like to Access Your Location” dialog.
If you’ve already denied access follow these steps on your Android or iOS device:
iOS
Open Settings → Privacy & Security → Location Services
Make sure that Location Services is on
Scroll down to find the Fernox App
Tap the app and select an option “While Using the App”.
Relaunch the app to confirm the change
Read more: https://support.apple.com/en-us/102647
Android
Open Settings → Apps & notifications (or Apps)
Manage Apps → Fernox App → Permissions
Tap Location → choose ”Allow only while using the app”
Relaunch the app to confirm the change
Read more: https://support.google.com/android/answer/9431959?hl=en-GB