Hi,The parameter in your request ("X-GW-IMS-User-Email") isn't part of the documentation or the sample code provided in the article : Digital Publishing Solution Help | Integrating with Adobe Digital Publishing SolutionPlease make sure that you have all the elements as follows :https://ims-na1.adobelogin.com/ims/token/v1?grant_type=device&client_id=your_client_ID&client_secret=your_client_secret&scope=AdobeID%2Copenid&device_token=your_device_token&device_id=your_device_id You can run the sample...

There's no way to force the navigation bar to stay up. It will go away when the reader interacts with the page to ensure the full screen is available for the reading experience.Neil