You’ll have to fake a MDM enrollment to get rid of the warning through registry entries, but loading the registry file in NTLite won’t work since it has to be processed after the unattended installation. This can be done by adding the registry entries with batch files to be run at Post-Setup
reg add "HKLM\SOFTWARE\Microsoft\Enrollments\FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" /t REG_DWORD /v EnrollmentState /d 1 /f reg add "HKLM\SOFTWARE\Microsoft\Enrollments\FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" /t REG_DWORD /v EnrollmentType /d 0 /f reg add "HKLM\SOFTWARE\Microsoft\Enrollments\FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" /t REG_DWORD /v IsFederated /d 0 /f reg add "HKLM\SOFTWARE\Microsoft\Provisioning\OMADM\Accounts\FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" /t REG_DWORD /v Flags /d 0x00d6fb7f /f reg add "HKLM\SOFTWARE\Microsoft\Provisioning\OMADM\Accounts\FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" /t REG_SZ /v AcctUId /d "0x000000000000000000000000000000000000000000000000000000000000000000000000" /f reg add "HKLM\SOFTWARE\Microsoft\Provisioning\OMADM\Accounts\FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" /t REG_DWORD /v RoamingCount /d 0 /f reg add "HKLM\SOFTWARE\Microsoft\Provisioning\OMADM\Accounts\FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" /t REG_SZ /v SslClientCertReference /d "MY;User;0000000000000000000000000000000000000000" /f reg add "HKLM\SOFTWARE\Microsoft\Provisioning\OMADM\Accounts\FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" /t REG_SZ /v ProtoVer /d "1.2" /f
