# If you want to change the port on a SELinux system, you have to tell
# SELinux about this change.
# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER
Port xxxx <-- specified port number
#AddressFamily any
#ListenAddress ::

if execute “sudo systemctl restart sshd.service”.

sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset:
   Active: activating (auto-restart) (Result: exit-code) since Sat 2019-12-07 20
:37:23 EST; 33s ago
     Docs: man:sshd(8)
  Process: 3016 ExecStart=/usr/sbin/sshd -D $OPTIONS $CRYPTO_POLICY (code=exited
, status=255)
 Main PID: 3016 (code=exited, status=255)

Dec 07 20:37:23 red systemd[1]: sshd.service: Failed with result 'exit-code'.
Dec 07 20:37:23 red systemd[1]: Failed to start OpenSSH server daemon.

You get error messages !
For fix error, following

Step1 edit “/usr/lib/firewalld/services/ssh.xml”.

  <description>Secure Shell (SSH) is a protocol for logging into and executing commands on remote machines. It provides secure encrypted communications. If you plan on accessing your machine remotely via SSH over a firewalled interface, enable this option. You need the openssh-server package installed for this option to be useful.</description>
  <port protocol="tcp" port="xxx"/> <-- specified port number. 

Step 2: Execute following comand.

#  semanage port -a -t ssh_port_t -p tcp xxxx <-- specified port number.