This issue with MyDevices portal has been resolved with the patch release of patch 4 on ISE version 126.96.36.1996. If you apply this parch and register your devices they would show up in the portal. However, the issue now is that they will always show up as NotRegistered. I have opened up a TAC case in regards to this issue and they have stated that its a cosmetic issue due to a bug which they are currently working with developers to resolve it in the next patch release.
Hope this helps.
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