Please allow at least 24 hours for your top up to be processed. Once processed, your myki pass will be added to your myki and will be activated the first time you travel in a zone for which it is valid. If your myki already has a myki pass, the new myki pass will not start until after the existing pass expires.
Now if their auto top-up could just include Passes as well as Money I'd be happy.
(Couldn't zap-off on the bus again yesterday, should I bother telling anyone?)