Sony PRS-T1 Not Showing Up in Adobe Digital Editions

Though my device, Sony eReader model PRS-T1, is listed under the supported devices (http://blogs.adobe.com/digitalpublishing/supported-devices), it does not appear when I open Digital Editions. I followed the directions at the following location: http://helpx.adobe.com/digital-editions/kb/transfer-ebook-ereader-digital-editions.html

Any ideas?

Thanks