I have had a few emails recently about a strange error from the Google .net Client library. Last night was the first time I saw it on one of my projects personally. I am not sure what is causing the problem exactly. But I can tell you how to fix it.
Error:”unauthorized_client”, Description:”Unauthorized client or scope in request.”, Uri:””
It seams to happen when there is a problem with one or more of the .dlls imported with the NuGet packages. All you have to do is re-install the NuGet package. You don’t even need to uninstall it first. Just run the NuGet command again. It should fix your problem.
If this doesn’t fix your issue please comment below so that we can find more ways of dealing with it.