About Blemish/Pimples Removal is not working in PS CC2018/2019

Hi there ,
I have experienced with Blemish/Pimples Removal function of Magic Retouch Pro that is not working in PS CC 2018/2019.
After I started brush with red spot when I click remove Blemishes ,the red sopt still stick on the photo, and nothing happened.
Could anyone help me to solve this problem? Thank you so much .