Do you know if it was eating F/T on it's own before (and I insist on it's own as some will be assisted in stores) if not you need to focus on having the snake feed not trying to switch it. That means offer live for 3 to 5 meals and then focus on switching.
I usually recommend to leave the animal alone no handling for a week before offering food you might have been in a rush to offer IMO, leave your snake alone for a week, no handling and try again.
You also want to walk away when the prey is snatched and not stare some will find it disturbing enough to abandoned their prey. It is normal for them to let go sniff the prey and then swallow it you taking it back and trying again is counter productive.
When it comes to F/T and young animal the most efficient method is to let the prey thaw at room temp near the enclosure to entice the snake to eat and let it thaw slowly and warm it up with a hair dryer, holding the prey from behind it's neck and dragging it moving it around like a live mouse would.
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