Following the guide for U2, I was trying to enable add a U2F token for a user.
In the self enrollment screen, unlike the screenshots in the guide, U2F option is not available.
Checking the admin panel for enabled authentication methods, U2F doesn't seem to available, either.
I read and word-searched the guide multiple times to see if this feature is available only on particular plans, as I use Duo Free but couldn't see such mention.
What am I missing?