there are two gRPC nuget packages. One for asp net core apps (has client and server support). this package require the asp.net core framework. two Grpc.Net.Client which is for .net core clients, but it requires http2 support in core.
neither of these packages will work with Blazor. Blazor WASM is a unique framework, and its HttpClient just calls javascript as WASM has no network support.
you want to use the browser version and call js interop.