Problem of permissions with my joinable usergroup

[Goodman_2020]

Hello

I have 3 usergroup

1. members (they can post threads and use the private messaging system)
2. Another group (they are supposed to don't be able to post thread and they shouldn't be able to use the private messaging system. This is a joinable usergroup from members to this group.
3. From this joinable usergroup, you can subscribe a paid subscription, to be able to use the private messaging system

My problem: every permissions are set fine, but when i test, the join request, after i am in the joinable usergroup (that shouldn't be able to psot thread and use private messaging system) i can use it... so i don't understand because i checked and re-checked and my permissions are "No" for this joinable usergroup

Help
Thx

[Dismounted]

A "yes" overrides a "no" in the vBulletin permissions system. Your "another group" must be the ONLY group for the user if the "no" is to work.