The mask will not auto select a subject no matter how many pictures i choose.

​@abstract_Gigglesa755 
 

Would you be able to provide some more information about which version of Lightroom you are using and on which device (Desktop, Mobile). This will help a member of the community or staff assist further.

Also, it may be worth posting screenshots or a brief video of the issue, if you don’t have a problem sharing the content.