This gadget is currently disabled in OnDemand instances due to the potential security risk. Sometimes it can contain arbitrary HTML which can make your system susceptible to XSS attacks.
There is currently a request to allow this gadget again, which you can see here. I encourage you to vote and comment on this to improve it's visibility and to also watch it so that you will get updates if the developers decide to implement this gadget once again.
Ah, sorry but there is a restriction on this ticket that I should have seen to begin with. What I can do is add the support ticket you originally escalated internally to the issue to raise awareness.
Thanks for your understanding.
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