If you are experiencing difficulty accessing your book on multiple devices, it is possible that the book is restricted to a single device reading only. In this case, you will need to open the book on the original device that it was downloaded to.
To ensure the best reading experience, it's recommended to check with the vendor of the book to see if there are any restrictions on device compatibility. If the vendor confirms that the book should be accessible on multiple devices, you may need to reinstall the reader app or clear the cache and cookies on your device.
In case of any further technical difficulties, it's recommended to reach out to the vendor's customer support for assistance.