The Oracle Manual Compliance is greyed out or unable to complete Oracle Compliance calculation even though the Snow Oracle Management Option Service is running. The following error is logged in C:\Program Files\Snow Software\Logs\OracleManagementOption:

2021-03-04 10:13:18.014 +01:00 [FTL] () Oracle management option runtime terminated unexpectedly.
System.IO.FileLoadException: Could not load file or assembly 'System.IO.Pipelines, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The located assembly's manifest definition does not match the assembly reference. (0x80131040)
File name: 'System.IO.Pipelines, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
  at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.CreateServiceContext(IOptions`1 options, ILoggerFactory loggerFactory)
  at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer..ctor(IOptions`1 options, IConnectionListenerFactory transportFactory, ILoggerFactory loggerFactory)
  at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
  at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context)

Behaviour appears to be caused by corruption on the System.IO.Pipeline.dll.

From a Snow Platform where Oracle Compliance is working:

1. Login in to Snow License Manager Server machine.
2. Navigate C:\Program Files\Snow Software\Snow License Manager\Services\OracleManagementOption.
3. Look for System.IO.Pipeline.dll.
4. Make a copy of that.
5. On the Snow Server Platform having issue, backup the existing System.IO.Pipeline.dll from C:\Program Files\Snow Software\Snow License Manager\Services\OracleManagementOption
6. Then perform the copy and paste of the file to C:\Program Files\Snow Software\Snow License Manager\Services\OracleManagementOption.

In the event that a single file did not resolve the issue, copy the folder C:\Program Files\Snow Software\Snow License Manager\Services\OracleManagementOption from a working same version of Snow License Manager then copy over to the environment having issue. Ensure to back up the older folder and to stop the services before and restart after.