I can't get a logged in instance of DropboxClient

In another post about the 10814 error it said I could ignore the error, but in this case it looks like I'm not getting the instance of DropboxClient even after I log in.

I get the following messages in my debug window:

When I run the following code:

    override func viewWillAppear(_ animated: Bool) {
        
        print("DropboxViewController.viewWillAppear(_:)")
        
        if let client = DropboxClientsManager.authorizedClient {
            
            // List contents of app folder
            _ = client.files.listFolder(path: "").response { response, error in
                if let result = response {
                    print("Folder contents:")
                    for entry in result.entries {
                        print(entry.name)
                        self.filenames?.append(entry.name)
                    }
                }
            }
            
        } else {
            // Present view to log in
            DropboxClientsManager.authorizeFromController(UIApplication.shared, controller: self, openURL: {(url: URL) -> Void in UIApplication.shared.openURL(url)})
        }
        
    }

This is code I copied from the PhotoWatch sample. It works there. I also don't get the error 10814 in PhotoWatch. Why will my code not work?

In another part of my code, I do notice that I am able to get an instance of DrobpoxClient using 

DropboxClient(accessToken:)