cannot approve or deny data requests
data request are not only dependand on cron, but also on tasks in scheduled tasks. so if you just made the data request, try running the scheduled tasks manually
yes i agreed, Several people reporting similar issues, i also included.
I think it just doesn't work very well.
just to follow up …
The actions Approve/Deny did appear after the following 2 items:
1) I waited for the Cron to run (actually ran the /admin/cron.php script)
2) I added a 'category' and 'purpose' to the "Data Registry" (previous to this, I had only added same to the "User" branch
Hope this helps someone in future - thanks!