two things. green wood cuttings are harder to root. they can rot quickly, or dry up quickly. you have to balance the moisture around it better than the hardwood cuttings.
second. the fact you said they turned soft and squish says that you had too much moisture water.
you can root cuttings yr around. there is no magic to it. although it seems like a magic at first, at least to me. if you are having problem rooting things, i suggest rooting in stages. first use ziploc bag or plastic shoebox to start the cuttings to root. once the roots are at least 1/4" long, move them to cup with soil of 50/50 perlite/seedling soil. once the roots are extensive, move to 1gal with same soil. if they survive the 1 gal, go to larger container after bare root and your choice of soil mix.
trick to getting cuttings to root is constant temp of 75-80 and some thing to hold moisture, barely moist. for example, you can put the cuttings wrapped in paper towel that was wet with water, but squeezed almost to a point where water can not be squeezed out any more. check it everyday or two for mold and excess moisture on the cuttings. wipe them down if there are any molds or excess moisture. it should root in 2-4 weeks. if no root by 4th week, move them to cup.
once in cup, keep them in humidity bin and do not water them until the cup is very very light. the water used to wet the soil mix prior to planting the cutting, if humidity bin is used, will last for months. once the cutting start to grow top/leaves and roots are extensive, you will have to watch them carefully. water need will increase dramatically. still you want to give very little water often then lot of water occasionally.
whole trick is controlling temp and water. in early stages, cutting will rot if too much water is provided. it will drawn itself and start to rot. but if there is no moisture what so ever, it will dry. so you will have to provided minimum level of moisture and monitor to make sure cutting will survive.