I would try at different times of the year when temps are above 60 but below 85ish.. scarify and non scarified ... in case there isn't info.. every variety that can be rooted has its trick and optimal period of hormone concentration
AI says spring/summer cuttings (trmlerature window), keep hunid use hormone and expect to take 2-3 months
Im airl layering a citrus which is said to be easy but according to some reads, takes a really long time.. I put a cutting in humidity and soil to see also...
I have a dwarf pineapple guava cross, the leaves are different but it came from the same seedlings but even the larger ones have not flowered yet in a few years