I wish I knew.
In my view,
Israel's update of his post (I can't remember what it originally said) didn't provide an answer to the questions in my reply, which would give an answer to folk in your position and who need to know:
1. What they should do
e.g. do you need to turn on https at the time of posting a request to activate https or only after Nabble have done whatever they need to do at their end, or do they need to wait until after Nabble have done their bit to switch to https
2. How (and in what timescale) Nabble would respond.
Because that will affect when a request might be posted as there's the possibility a site will be left with a link to a forum when it should appear embedded.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.