The account for PolyBase Engine service is not allowed.
When you install SQL Server 2016 and select the option to use the server as part of a PolyBase scale-out group, after setting a builtin account like "NT Authority\NETWORK SERVICE" as service account for the PolyBase services, you may get the following message:
The specified account for SQL Server PolyBase Engine
(same error for PolyBase Data Movement) service is not allowed because you have
chosen to either install this instance as part of a SQL Server failover cluster
or to use this instance as a part of PolyBase scale-out group. To continue,
provide a domain account for the SQL Server PolyBase Engine service.
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