Hey @KatherineKe
Could you check the below once:
Do you see any errors in the browser console ?
Do you see the Target network call ? If you are using at.js (2+) It should be 'delivery' call in your network panel.
Do you for sure, qualify in the activity? Look into the 'delivery' call and check if you are indeed qualifying for the activity.
There can also be some browser extension interfering with your activity execution.
Let us know what you see for the above.
Cheers