Windows 11 guest OS install is not supported on Citrix Hypervisor 8.2CU1.
Status of Windows 11 support on Citrix Hypervisor 8.2 Cumulative Update 1:
Due to the significant changes required, Windows 11 support will not be made available on the existing Citrix Hypervisor 8.2 LTSR.
Introducing XenServer 8 (preview)
Our latest release, XenServer 8, provides Windows 11 and vTPM support. To learn more, go to www.xenserver.com .