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Well that's because you don't define a separate allow rule for upsert, only for insert, update, and remove (http://docs.meteor.com/#allow). Furthermore, "upsert is the same as calling update with the upsert option set to true (..)" (http://docs.meteor.com/#upsert).

So the up short is: just make sure your rule for updating is correct.

Meteor client side upsert not allowed - Stack Overflow

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