You cannot use your on-premises servers to implement AVD session hosts. These hosts are Azure VMs running either Windows Server or Windows 10/11 multi-session. For using AVD with Intune, refer to https://learn.microsoft.com/en-us/mem/intune/fundamentals/azure-virtual-desktop
Btw keep in mind that Intune does not support Windows Server OS (at least not to the same extent as it does Windows 10/11)
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hth
Marcin