1. If the activity of yeast is insufficient, try to adjust the temperature to about 40 degrees to activate the activity of yeast.
2. You can also add a proper amount of yeast, and mix it well to disperse the yeast.
3. The ratio of yeast to flour is 1: 100, and the preserved dough can be adjusted according to this ratio.
These are the reasons why some candied fruits are not fermented and the remedial measures.