On Registration Assign Usergroup

[Zikron]

I'm adding a new forum that will only be view-able by around 1,000 users to report feedback on a product. The way that I need to accomplish this is by only allowing specific accounts to view and access this forum. Hiding or password protecting the forum is not an option for me.

To do this, based on what I have learned, I need to assign users to a usergroup and grant privileges to said usergroup. The vast majority of the users will be creating new accounts so I would like to automate this during the registration process rather than

I have found this mod - https://vborg.vbsupport.ru/showthrea...90#post2226190 but the problem is that it allows users to select their group and I do not want to give them the option or even let them know what the group is.

So I was wondering if there is a way or something that already exists that will allow the user to enter a password, if the password is correct they are assigned to another usergroup. Either that or I can build a second registration form with a hidden field that is detected and assigns to the appropriate usergroup.

Thank you for anyone that reads, even bigger thanks to those that can help