I had a operating bot that I tried to push an update to and got a failure response. I tried building and deploying in Kudu with no luck either. Just as a sanity check I also made a brand new echobot on Azure and tried to run the build and deploy commands in Kudu Console.
EDIT: Meant to mention I've seen a few other mentions of similar issues including: Error - Access is denied - deployment to Azure App Services https://github.com/projectkudu/kudu/issues/3177 https://medium.com/rare-crew/hot-issue-on-azure-and-deployment-of-apps-by-kudu-scripts-dotnet-sdk-v3-1-301-92d6e336756a
MSBUILD : error MSB1025:Unhandled exception. An internal failure occurred while running MSBuild.
System.ComponentModel.Win32Exception (5): Access is denied.
at System.Diagnostics.Process.set_PriorityClassCore(ProcessPriorityClass value)
at System.Diagnostics.Process.set_PriorityClass(ProcessPriorityClass value)
at Microsoft.Build.CommandLine.MSBuildApp.Execute(String[] commandLine)
System.ComponentModel.Win32Exception (5): Access is denied.
at System.Diagnostics.Process.set_PriorityClassCore(ProcessPriorityClass value)
at System.Diagnostics.Process.set_PriorityClass(ProcessPriorityClass value)
at Microsoft.Build.CommandLine.MSBuildApp.Execute(String[] commandLine)
at Microsoft.Build.CommandLine.MSBuildApp.Main(String[] args)
Failed exitCode=-532462766, command=dotnet restore "EchoBot.sln"
An error has occurred during web site deployment.