The button to receive power stones is greyed or just doesn't appear at all.
The message 'This novel doesn't support power stones' is displayed when you or someone else try to vote with power stones.
Another symptom your novel didn't go through veto already is that you can't see it in the author's profile.
It's not a bug.
A new novel will be screened for forbidden content before this feature is turned on.
How long it takes?
Usually, 4 work days, or longer if WN receives an uncommon influx of new novels or there's a national holiday in Singapore.
No need to worry, pull off your hair or create a thread just for it. Just be patient.
If it takes longer than it and the button wasn't activated, then you need to talk to them through their customer service or email firstname.lastname@example.org
If someone else has anything to add, please feel free to.