In oracle linux 8 also installs but does not start fail2ban.
Command systemctl status fail2ban response:
● fail2ban.service - Fail2Ban Service
Loaded: loaded (/usr/lib/systemd/system/fail2ban.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Thu 2021-12-16 19:20:55 MSK; 23s ago
Docs: man:fail2ban(1)
Process: 1180934 ExecStart=/usr/bin/fail2ban-server -xf start (code=exited, status=203/EXEC)
Process: 1180932 ExecStartPre=/bin/mkdir -p /var/run/fail2ban (code=exited, status=0/SUCCESS)
Main PID: 1180934 (code=exited, status=203/EXEC)
Dec 16 19:20:55 web-server systemd[1]: fail2ban.service: Service RestartSec=100ms expired, scheduling restart.
Dec 16 19:20:55 web-server systemd[1]: fail2ban.service: Scheduled restart job, restart counter is at 5.
Dec 16 19:20:55 web-server systemd[1]: Stopped Fail2Ban Service.
Dec 16 19:20:55 web-server systemd[1]: fail2ban.service: Start request repeated too quickly.
Dec 16 19:20:55 web-server systemd[1]: fail2ban.service: Failed with result 'exit-code'.
Dec 16 19:20:55 web-server systemd[1]: Failed to start Fail2Ban Service.
If do not install via the panel but via a command yum install fail2ban yourself, then fail2ban start fine.