The same failure happened to my cuttings last spring, 15 cuttings from 2 sources. I ended up with 2 plants, im sure it was lo humidity as I used plastic bags to contain the moisture. This year I used plastic bins, 10 cuttings were from last fall from the internet, 30 were from a 30 year old tree that survived our maryland winters unprotected. but the above ground part didnt survive last years polar vortex. All were Refrigerated untill end of feb , of the 10 , 8 rooted and grew of the 30 that were cut at the end of Dec. (before this years polar vortex) from new growth that summer, maybe 2 will survive, roots and leaf survival were the failures, all 40 were rooted in the same bins. My conclusion is that rooting and surviving depends in some part on the cutting, as when cut, age of the wood, possibly variety, and maybe more. I also bought 2 rooted cuttings off the internet also both survived and all are now 3' high.
Final answer, keep trying.