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.
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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.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X