Your current version of Bigfix (9.5.6.63) is not supported for Windows 2019. Support for Bigfix server starts with Bigfix 9.5.17 or higher. You should have a fixlet in the Bigfix console to upgrade to 9.5.17
Upgrade Bigfix documentation here:
https://help.hcltechsw.com/bigfix/9.5/platform/Platform/Installation/c_manual_upgrade.html
ILMT 9.2.27 is supported for windows 2019.
#SupportMigration#AIX
#Support