I've been here I think.
at a guess your collider needs to be set to "is trigger" (a checkbox on your collider).
at a guess this will negate it's use as a platform which means you'll need another collider that isn't a trigger on an empty GameObject inside your platform GameObject.
It'll also need to be smaller than your trigger collider or you may not get a trigger.
finally your gameObject.tag may be wrongly spelled etc.
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