We are seeing the following after creating a team LAN using the Windows 2016 teaming facility as normal:

Log Name: System
Source: Microsoft-Windows-MsLbfoSysEvtProvider
Date: 10/05/2018 07:53:44
Event ID: 16945
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: %computername%.domain.suffix
Description:
MAC conflict: A port on the virtual switch has the same MAC as one of the underlying team members on Team Nic Microsoft Network Adapter Multiplexor Driver
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-MsLbfoSysEvtProvider" Guid="{387ed463-8b1b-42c9-9ef0-803fdfd5d94e}" EventSourceName="MsLbfoProvider" />
<EventID Qualifiers="32768">16945</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2018-05-10T06:53:44.348965900Z" />
<EventRecordID>715017</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="6276" />
<Channel>System</Channel>
<Computer>%computername%.domain.suffix</Computer>
<Security />
</System>
<EventData>
<Data Name="DriverObject">
</Data>
<Data Name="Member">Microsoft Network Adapter Multiplexor Driver</Data>
</EventData>
</Event>