HMACSHA256 not hasing the same in Core and in standard library

Hi,

I have a library made with Standard 2.0 framework which create a http request with an API key authaurization header using HMACSHA256.

I have the same decoding code in a ASP.NET Core application and the hashing is not the same, so I can't use it.

Both use system.security.cryptography namespace.

If I check the definition, the application use this dll:

C:\Program Files\dotnet\sdk\NuGetFallbackFolder\netstandard.library\2.0.1\build\netstandard2.0\ref\netstandard.dll

The library use this dll:

C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.0.0\ref\netcoreapp2.0\System.Security.Cryptography.Algorithms.dll

How come the same function doesn't hash the same way??

I've check the data I hash in both place and it's the same, so it's really the hashing that's not the same.

Is it possible to use the same dll?

Thanks