PLEASE NOTE - brands such as Xiaomi / Huawei / Oppo / OnePlus may have their own proprietary operating system installed on their devices (MIUI & EMUI / HarmonyOS / ColorOS / OxygenOS)
which may not be fully compatible with the NUACOM mobile app as it has been built for Android devices.
Open the Phone Icon
Open the Settings option
Open the Calling Accounts option
Open the All Calling Accounts option
Set the slider to green this should allow the Nuacom Profile to work on the phone and the extension should now work with the Mobile App (Run a test to make sure)