how to fix error A server-side database availability group administrative operation failed. Error The operation failed. CreateCluster errors may result from incorrectly configured static addresses. Error: Windows Failover Clustering isn’t installed on ‘SRVEX01’’.
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Description
When you deploy Exchange DAG add host memeber to DAG have error below
Cause
Because Ipv6 enable on server member
Solution
If you encounter this problem, disable IPv6 by creating a new 32-bit DWORD registry value called DisabledComponents under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters and give it the value of ffffffff. Once complete, restart the server.

Disable ipv6 on nic card network
Good luck
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