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Hmmm, it seems as if the node for <GroupID> is no longer supported or recognized, the setting that comes from the option shown here that lets you specify "logon from a certain group"

I found this in a quick search. Looks like it's been some sort of an issue for a while. Odd how things that were working, just suddenly seem to stop, and based on this, others have seen the same thing. https://social.technet.microsoft.com/Forums/ie/en-US/b6fd6efd-efe9-421c-8733-5e18f80552ae/c[…]d-task-with-group-policy-preferences?forum=winserverGP

Indeed. It appears that if you want it to simply run a task in the user context, this is achievable - you set the group in "when running the task, use this user account" and then set the trigger as "logon of any user". So it runs for anyone but only if they are in the group. However, if (as I do) you want to run the task when any member of that group logs on and run it another user context (e.g. elevated), you can't do this - it is the group selection dialog on the "Triggers" tab that doesn't work 😞

That sucks. Never tried it before myself, but I can see the value in being able to do what you are trying.