CentOS 7 SSH and 2FA (ESET Secure Authentication) - linux

Question

I am stuck at getting two factor-authentication in CentOS 7 to work; specifically the authentication via SSH and OTP.
I would very much appreciate it if someone could assist me with this. :)
Here is a log of an attempt to login via SSH with the account "ws-admin#test.local":
sshd[3652]: pam_radius_auth: Got user name ws-admin#test.local
sshd[3652]: pam_radius_auth: ignore last_pass, force_prompt set
sshd[3652]: pam_radius_auth: Sending RADIUS request code 1
sshd[3652]: pam_radius_auth: DEBUG: getservbyname(radius, udp) returned 0x7fa56490e1c0.
sshd[3652]: pam_radius_auth: Got RADIUS response code 11
sshd[3652]: pam_radius_auth: authentication failed
sshd[3652]: pam_sepermit(sshd:auth): Parsing config file: /etc/security/sepermit.conf
sshd[3652]: pam_sepermit(sshd:auth): Enforcing mode, access will be allowed on match
sshd[3652]: pam_sepermit(sshd:auth): sepermit_match returned: -1
sshd[3652]: pam_sss(sshd:auth): authentication success; logname= uid=0 euid=0 tty=ssh ruser= rhost=10.0.0.31 user=ws-admin#test.local
sshd[3652]: Failed password for ws-admin#test.local from 10.0.0.31 port 57962 ssh2
sshd[3652]: Connection closed by 10.0.0.31 [preauth]
Below follow Configuration- and Setup-Infos
The test-environment is given by my companys infrastructure; we use mainly Windows-Clients and about the same share of Windows- and Linux-Servers.
Win-Server: Windows Server 2016 x64
Active Directory: Test.local
ESET Secure Authentication (RADIUS Server)
Shared Secret with Client: test345
Option "Use Access-Challenge feature of RADIUS" is enabled
Linux-Client/Server: CentOS 7 x64
joined Domain Test.local via realm
Local Login with AD-Accounts and OTP-2FA at all times possible
SSH Login with any Account only possible if pam_radius_auth.so not set to required in /etc/pam.d/sshd (which means no 2FA)
Configuration of the Linux-Client/Server:
RADIUS-Server and Shared-Secret are added in /etc/raddb/server
pam_radius_auth.so is in /usr/lib64/security/
auth required pam_radius_auth.so added to /etc/pam.d/sshd and /etc/pam.d/login
/etc/pam.d/login
#%PAM-1.0
auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so
auth substack system-auth
auth include postlogin
auth sufficient pam_radius_auth.so
account required pam_nologin.so
account include system-auth
password include system-auth
# pam_selinux.so close should be the first session rule
session required pam_selinux.so close
session required pam_loginuid.so
session optional pam_console.so
# pam_selinux.so open should only be followed by sessions to be executed in the user context
session required pam_selinux.so open
session required pam_namespace.so
session optional pam_keyinit.so force revoke
session include system-auth
session include postlogin
-session optional pam_ck_connector.so
/etc/pam.d/sshd
#%PAM-1.0
auth required pam_radius_auth.so debug
auth required pam_sepermit.so debug
auth substack password-auth debug
auth include postlogin debug
# Used with polkit to reauthorize users in remote sessions
-auth optional pam_reauthorize.so prepare
account required pam_nologin.so
account include password-auth
password include password-auth
# pam_selinux.so close should be the first session rule
session required pam_selinux.so close
session required pam_loginuid.so
# pam_selinux.so open should only be followed by sessions to be executed in the user context
session required pam_selinux.so open env_params
session required pam_namespace.so
session optional pam_keyinit.so force revoke
session include password-auth
session include postlogin
# Used with polkit to reauthorize users in remote sessions
-session optional pam_reauthorize.so prepare
/etc/raddb/server
# server[:port] shared_secret timeout (s)
10.0.0.1 test345 5