How long does it take for the webinar add-on to become active?

[Hardy_Girls]

I, the plan owner, purchased the webinar add-on for our Pro account earlier today. The payment has completed and I've assigned the feature to one of our 2 licensed users. I am able to schedule meetings for this user and am trying to convert the previously scheduled meeting to a webinar. When I select the option to do so, a message pops up stating that the meeting cannot be converted because the user doesn't have that feature and will need to request it from me. But again, I've already assigned the feature to them and can see that it is there in their user profile. Is there a delay in full-functionality?