MaxDOP Limits SQL Server 2016 Standard
SQL Server 2016 Enterprise Edition allows you to set maxdop to any value up to 64.  However, SQL Server 2016 Standard Edition has limits around parallelism, per this docs page:


Partitioned table parallelism is not supported.
Standard Edition is not NUMA Aware and does not support Large Page Memory and Buffer Array Allocations
The degrees of process parallelism (DOP) for an index build is limited to 2 DOP for the Standard Edition
Limited to lesser of 4 sockets or 24 cores