So what do you suggest I do? Is it something I need to fix or do I just have to wait until launch and hope it works?
Well, it is only affecting the moderators? Not you?
It's affecting Moderators and Administrators, basically everyone who has access to the feature.
That is of course a concern. Is it possible for you to run a live test? Maybe try out the set up on a localhost?
I've installed that but not sure what to do now to do the live test.
Ok, have you installed MyBB on it?
Then you need to copy the database and all files across.
I'm not sure how to do that, I just have this desktop program:
You need to install MyBB on it
install mybb on xampp video << try that in Google search.