Auto-Target activity / preview links not working

Hi all,

We tested an activity using Auto-Allocate which has ended successfully. Now, we want to run it as an always-on activity using Auto-Target. I was hoping I would just be able to amend the AA campaign and change the traffic allocation to AT, however traffic allocation isn't editable anymore.

So we created a copy of the AA campaign (the original AA campaign isn't active anymore but was working perfectly fine, including preview links) and changed the traffic allocation to being Auto-Target in the copy. However, the preview links don't trigger the experience anymore and we can't see the change appear whatsoever.

What do you think is happening? Please help!

Thanks,

Millie