HealthKit Error Code=3

I am currently receiving the following issue when my app requests access to the mindful minutes store:

Error Domain=com.apple.healthkit Code=3 "Failed to look up source with bundle identifier "com.myorg.myapp"" 
UserInfo={NSLocalizedDescription=Failed to look up source with bundle identifier "com.myorg.myapp"}

The app does not crash however the authentication page does not in fact display.

This is strange because this was working perfectly in previous versions of my app (since which I have made very few alterations).

The following is the code I am using to request the authentication:

let typesToShare = Set([
  HKObjectType.categoryType(forIdentifier: HKCategoryTypeIdentifier.mindfulSession)!
])

self.healthStore.requestAuthorization(toShare: typesToShare, read: nil) { (_, error) -> Void in
  if let error = error {
  print("\(error)")
  }

  DispatchQueue.main.async {
  self.performSegue(withIdentifier: "openWalkthroughThree", sender: self)
  }
}

Initially, I thought this was an issue with code signing. However, I have completely refreshed all my certificates and it still is not working.

I would greatly appreciate a nudge in the right direction to solve this issue (specifically what the error actually is).