In T282636, we made Automatic Topic Subscriptions available as an opt-in beta feature at all Wikimedia wikis except those wikis that were participating in the New Discussion Tool A/B test (T291306). [i]

This task is about making Automatic Topic Subscriptions available as an opt-in beta feature at the wikis that participated in the New Discussion Tool A/B test (T291306).

i. You can find more information about why we excluded these wikis from the initial Automatic Topic Subscription deployment in T290502#7494259