uupdump cannot offer what it does not have or exist supposedly, Server arm64 was released for OEMs only
It's a OEM only edition used mainly on Azure. It maybe could be converted from the base of Win10 17763 ARM64.
You are here. converted from the base of Win10 17763 ARM64? Really? Where are those ARM64 Server components?
Sadly the specific ServerARM64 components are nonexistent, but you can install RSAT Server Manager and add ServerDatacenter licence files to ARM64 Windows. That is propably the closest thing to real ServerARM64 what we can have now.
The only first and last leaked ARM64 server build was 10.0.14324.1001.rs1_onecore_mqsrv_sc.160414-1853_amd64fre_server-serverarm64_retail_en-us-DVD_ROM Code: Name: 10.0.14324.1001.rs1_onecore_mqsrv_sc.160414-1853_amd64fre_server-serverarm64_retail_en-us-DVD_ROM.iso Size: 1992761344 bytes (1900 MB) SHA1: 3E1BBFED2FFA6D85F90F254D5339FF29860CF8B8