If a HPE model switch, primarily 5500, 5510, 5520 & 5130 model switches are only asking you to log in when you SSH or if you console into member one, but not if you console into any other member, then you need to add the below.
[HPE]line aux 1
[HPE-line-aux1]authentication-mode scheme
If you look below, you can see it is only added to aux 0. So you need to add it to aux 1 and any other you might have if you have more than 2 members in the IRF or stack. This example is from a IRF.
#
line aux 0
authentication-mode scheme
user-role network-admin
#
line aux 1
user-role network-admin