Duh, my fault. That will only let the field group appear on posts in that category. There isn’t a location rule that exists for adding field groups to specific terms (term editor page), only for all of the terms in a taxonomy.
You need a custom location rule for this https://www.advancedcustomfields.com/resources/custom-location-rules/. This is a fairly common one, but I don’t have an example. I’m sure that somewhere on this forum there is an example for this location rule but I can’t seem to find it right now.
