Allow subscribing to an intersection of category + project

+1. On the same topic, there is no notification for tags intersection either.

You can search for the combination by using the intersection search[1]:
https://forum.ansible.com/tags/intersection/TAG1/TAG2/TAG3

For example for awx + collection :
https://forum.ansible.com/tags/intersection/collections/awx

But there is no subscribe button. So keeping an eye for a combination of them also requires to check a browser bookmark right now.

[1] I originally posted about intersections here.