Whilst building my iOS app on Azure Mobile Center, I was getting this error:
/Library/Frameworks/Mono.framework/Versions/4.8.1/lib/mono/msbuild/15.0/bin/Microsoft.Common.CurrentVersion.targets(3048,5): error MSB3323: Unable to find manifest signing certificate in the certificate store. [/Users/ci/agent/vstsagent/_work/1/s/Mobile/Mobile.iOS/Mobile.iOS.csproj]