as mentioned, they are young so it may just take another year. I have seen some make a few fruit at 2 yrs but most wait for the 3rd or 4th year to make good fruit.
I was told its best to cut off all fruit until year 4 so it can use all its energy growing large and strong to resist freezes and such. some say it doesn't matter but with mine it did seam to help them grow better the year I cut the fruit off as soon as they made little balls.
its also a light freeze can do it, even if only a few leaves fall off and it otherwise looks fine it may not flower and make fruit the next year.
I have a Satsuma and orange tree (4 and 5 yrs old) and both made no fruit because last year there was a 2 day "light" freeze and both dropped about half their leaves which quickly grew right back and the trees never seamed sick at all
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