Description of problem:
Just install the Nomachine 7.6.2, the message will appear. Don't need any step to replicate.
SELinux is preventing systemd from 'ioctl' accesses on the file /usr/lib/systemd/system/nxserver.service.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that systemd should be allowed ioctl access on the nxserver.service file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'systemd' --raw | audit2allow -M my-systemd
# semodule -X 300 -i my-systemd.pp

Additional Information:
Source Context                system_u:system_r:init_t:s0
Target Context                system_u:object_r:nx_unit_file_t:s0
Target Objects                /usr/lib/systemd/system/nxserver.service [ file ]
Source                        systemd
Source Path                   systemd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
SELinux Policy RPM            selinux-policy-targeted-35.1-1.fc35.noarch
Local Policy RPM              selinux-policy-targeted-35.1-1.fc35.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 5.14.11-300.fc35.x86_64 #1 SMP Sun
                              Oct 10 14:36:25 UTC 2021 x86_64 x86_64
Alert Count                   54
First Seen                    2021-10-16 14:24:28 +08
Last Seen                     2021-10-16 14:24:29 +08
Local ID                      450df685-40c9-4f37-b351-42f8f5a26e13

Raw Audit Messages
type=AVC msg=audit(1634365469.499:373): avc:  denied  { ioctl } for  pid=1 comm="systemd" path="/usr/lib/systemd/system/nxserver.service" dev="dm-0" ino=715 ioctlcmd=0x5401 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:nx_unit_file_t:s0 tclass=file permissive=0


Hash: systemd,init_t,nx_unit_file_t,file,ioctl

Version-Release number of selected component:
selinux-policy-targeted-35.1-1.fc35.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.15.2
hashmarkername: setroubleshoot
kernel:         5.14.11-300.fc35.x86_64
type:           libreport

Potential duplicate: bug 1769673