Issue
Metadata object with the same name is defined in multiple assemblies.
##[error]C:\DynamicsSDK\Metadata\Microsoft.Dynamics.AX.Application.Build.targets(40,5): Error : Error: AxTableExtension/InventSite.ACXPowerBIExtension/Name - Metadata object with the same name is defined in multiple assemblies: 'WOWMOMO,ACXPOWERBI'
Resolution
Search the Table Extension InventSite.ACXPowerBIExtension in Application Explorer.

Go the K:\AosService\PackagesLocalDirectory Folder. Choose your model folder and remove extra copy or duplicate copy of InventSite.ACXPowerBIExtension from your model.

Restart visual studio and start build and sychronisation.