Symptoms
Life Cycle Manager (LCM) support for Windows Server 2019 with Hyper-V has been purposefully removed temporarily from the currently shipping LCM version 2.4.1.
Windows Server 2016 with Hyper-V LCM support is unaffected and is still present and functional in LCM 2.4.1.
Cause
Windows Server 2019 with Hyper-V support in LCM 2.4.1 was removed due to a compatibility issue.
Windows Server 2016 with Hyper-V LCM support is unaffected and is still present and functional in LCM 2.4.1.
Resolution
Windows Server 2019 with Hyper-V LCM support was restored in a code fix in LCM 2.4.2,released in late June 2021.