Move-ADDirectoryServerOperationMasterRole

Do not use the server FQDN for the Identity in the Move-ADDirectoryServerOperationMasterRole Cmdlet, it will fail if you do:

Move-ADDirectoryServerOperationMasterRole -Identity "DC001.domain
.suf" -OperationMasterRole InfrastructureMaster

Move-ADDirectoryServerOperationMasterRole : Cannot find directory server with identity:"DC001.domain
.suf"

Correct Syntax=
Move-ADDirectoryServerOperationMasterRole -Identity "DC001" -OperationMasterRole InfrastructureMaster