MissingMethodException on getInstance

[bc3tech]

Trying to use this w/in an Azure Function and getting

System.TypeInitializationException
  HResult=0x80131534
  Message=The type initializer for 'com.ibm.msg.client.jms.JmsFactoryFactory' threw an exception.
  Source=com.ibm.mq.allclient-9.0.4.0
  StackTrace:
   at com.ibm.msg.client.jms.JmsFactoryFactory.getInstance(String connectionTypeName)
   at Producer.IBMMQ.Functions.<>c.<.cctor>b__8_0() in C:\Users\...\IBMMQ\Functions.cs:line 23
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)

Inner Exception 1:
TypeInitializationException: The type initializer for 'com.ibm.msg.client.commonservices.trace.Trace' threw an exception.

Inner Exception 2:
TypeInitializationException: The type initializer for 'com.ibm.msg.client.commonservices.propertystore.PropertyStore' threw an exception.

Inner Exception 3:
TypeInitializationException: The type initializer for 'com.ibm.msg.client.commonservices.CommonServices' threw an exception.

Inner Exception 4:
MissingMethodException: Method not found: 'Void System.IO.FileStream..ctor(System.String, System.IO.FileMode, System.Security.AccessControl.FileSystemRights, System.IO.FileShare, Int32, System.IO.FileOptions)'.

could very well be related to #1 , but thought I'd file it.