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vCenter Server version is 8.0U2When you right-click on a VM in the vSphere Client and click Edit Settings > Virtual Hardware > Network adapter > MAC Address and change the drop down from Automatic to Manual then enter a MAC Address manually and click OK the task appears to complete successfully. However checking the configured MAC Address shows that it is still set to Automatic and the previous MAC Address.
VMware is aware of this issue and working to resolve this in a future release.
You should be able to modify the MAC Address via the ESXi Host Client.Right-click the Virtual Machine and select Edit Settings > Network Adapter > MAC Address, then change the dropdown option from Automatic to Manual and configure the required MAC Address and click SAVE.
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