I rebuilt the achievements data, created the new user group and re-enabled the promotion task, in that order.
No manual promotions were made.
Here is an example:
Please ignore the previous promotion on Wednesday. The group was deleted and recreated once I became aware the rebuild was necessary.
They are at rank "New Person", which is not enabled in the group promotion rules in this post:
I've updated my access information if you'd like to take a look.