Form worked for me today BUT only by using serial number as on back of stick. This is the device ID in settings. I'll see what happens in 3-5 days when delivery is due.
kande000
upon filling out an application for a free HDMI extension, I enter the SN for my Roku streaming stick it says invalid. I haven't collected any sort ofthing on both my Roku devices and I really need them for both as it's causing remote problems.
For reasons only Roku knows, devices have a Device ID and a Serial Number and the labels are often switched on the packaging or device itself. Look under Settings->System->About and you'll see both numbers. If one doesn't work, try the other.
In the meanwhile...
There's nothing special about the Roku HDMI extender, it's just a short (4 inches or so) HDMI extension cord with an HDMI plug at one end and an HDMI socket at the other. I use an HDMI extension cable several feet long to locate my Streaming Stick+ in an equipment closet on the other side of the wall from my TV. You may be able to find an HDMI extension locally or at a non-Roku online vendor and get one faster than waiting for Roku to process your order and ship it to you. Or use a female-to-female HDMI connector to connect your Roku Stick to a regular (non-extension) HDMI cord.
I had the same issue. When I entered a zero for each "O" (instead of the letter O), it worked immediately!!