Problem with a Missing Purpose String

I keep getting the following message when I upload our app for testing to testflight.


"ITMS-90683: Missing Purpose String in Info.plist - Your app's code references one or more APIs that access sensitive user data. The app's Info.plist file should contain a NSLocationAlwaysUsageDescription key with a user-facing purpose string explaining clearly and completely why your app needs the data. Starting Spring 2019, all apps submitted to the App Store that access user data are required to include a purpose string. If you're using external libraries or SDKs, they may reference APIs that require a purpose string. While your app might not use these APIs, a purpose string is still required.".


We have added two NSLocationAlwaysUsageDescription strings to our info.plists (one for the mobile app and one for the apple watchkit extension, but the warning is still present when upploading.


Do we also have to check with all third party applications and their Purpose String that our app is using or do we only have to add the strings to our "own" code?


Regards

Fredrik