Xcode reports libgrpc_csharp_ext.a does not contain bitcode

I am using the experimental plugin for Unity in C#. I followed the instruction here

After exporting my Unity project to Xcode and compiling the exported project I am getting this error:

/../Libraries/Plugins/Grpc.Core/runtimes/ios/libgrpc_csharp_ext.a(grpc_csharp_ext.o)' does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture arm64

I am using Xcode 10, and deployment target: 11.2

Has anyone tried this plugin for Unity in iOS?