This is truly the article I would have LOVED to have found when we first got the DHCP settings in for our Lync Phone Edition devices and other Lync phones, and were going crazy trying to figure out why the LPE devices were fine right after being tethered to a PC, but were not if someone logged in and out of them while disconnected and after rebooting. And that I sort of promised to write when I was raving about a certain switch.

The symptoms: Test-CsPhoneBootstrap works flawlessly. Other Lync phones can log on with extension and PIN. Your Lync Phone Edition device (in our case, the Polycom CX3000) will cheerfully log on with the extension and PIN if you’ve logged it in tethered to a PC via the PC’s Lync client first, but gives you “An account matching this phone number cannot be found. Please contact your support team” after a very quick flash of another error, “Account used is not authorized, please contact your support team” for the very same extension and PIN if you’ve logged out of the device and powered it down. I did what another admin did, taking a video on my phone, then replaying it really slowly – the time from entering the PIN to getting the final failure message was less than 4 seconds, and that was necessary to see the first failure message that briefly flashed on the screen.

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