Download the latest client libraries for Analysis Services. This needs to be done on your local machine so you can then copy these files to your Azure Function App.
After you’ve downloaded the client libraries, the DLLs can be found in C:\Program Files (x86)\Microsoft SQL Server\140\SDK\Assemblies. The two files you need are:
C:\Program Files (x86)\Microsoft SQL Server\140\SDK\Assemblies\Microsoft.AnalysisServices.Core.DLL
C:\Program Files (x86)\Microsoft SQL Server\140\SDK\Assemblies\Microsoft.AnalysisServices.Tabular.DLL
This step is important because the documentation in Azure references the 130 assemblies, which will not work. You need the assemblies in 140 otherwise you’ll get errors.
Dustin walks through the whole process of setting up an Azure Function step by step.