I can confirm that this issue is there in the latest version of Powershell core 6 / azure functions and is a blocker for us. Is there a known work-around to get this working on azure functions or perhaps an estimated ETA of when we think this may be addressed?

In my scenario, I am loading a community module for cosmosdb ( https://www.powershellgallery.com/packages/CosmosDB/3.2.4.376) inside an azure powershell function. This module uses a custom type definition which yields an error when ran in azure functions only:

[6/18/2019 3:39:54 PM] ERROR: Unable to find type [CosmosDB.ContextToken].
[6/18/2019 3:39:54 PM] Result: ERROR: Unable to find type [CosmosDB.ContextToken].
Exception: Unable to find type [CosmosDB.ContextToken].
Stack: at System.Management.Automation.TypeOps.ResolveTypeName(ITypeName typeName, IScriptExtent errorPos)

this is the custom type definition as per the community module

if (-not ([System.Management.Automation.PSTypeName]'CosmosDB.Context').Type)
{
    $typeDefinition = @'
namespace CosmosDB {
    public class ContextToken
    {
        public System.String Resource;
        public System.DateTime TimeStamp;
        public System.DateTime Expires;
        public System.Security.SecureString Token;
    }

    public class BackoffPolicy
    {
        public System.Int32 MaxRetries;
        public System.String Method;
        public System.Int32 Delay;
    }

    public class Context
    {
        public System.String Account;
        public System.String Database;
        public System.Security.SecureString Key;
        public System.String KeyType;
        public System.String BaseUri;
        public CosmosDB.ContextToken[] Token;
        public CosmosDB.BackoffPolicy BackoffPolicy;
    }

    namespace IndexingPolicy {
        namespace Path {
            public class Index {
                public System.String dataType;
                public System.String kind;
            }

            public class IndexRange : CosmosDB.IndexingPolicy.Path.Index {
                public readonly System.Int32 precision = -1;
            }

            public class IndexHash : CosmosDB.IndexingPolicy.Path.Index {
                public readonly System.Int32 precision = -1;
            }

            public class IndexSpatial : CosmosDB.IndexingPolicy.Path.Index {
            }

            public class IncludedPath
            {
                public System.String path;
                public CosmosDB.IndexingPolicy.Path.Index[] indexes;
            }

            public class ExcludedPath
            {
                public System.String path;
            }
        }

        public class Policy
        {
            public System.Boolean automatic;
            public System.String indexingMode;
            public CosmosDB.IndexingPolicy.Path.IncludedPath[] includedPaths;
            public CosmosDB.IndexingPolicy.Path.ExcludedPath[] excludedPaths;
        }
    }

    namespace UniqueKeyPolicy {
        public class UniqueKey {
            public System.String[] paths;
        }

        public class Policy
        {
            public CosmosDB.UniqueKeyPolicy.UniqueKey[] uniqueKeys;
        }
    }
}
'@
    Add-Type -TypeDefinition $typeDefinition
}

$PSVersionTable
----------------------
Name                           Value
----                           -----
PSVersion                      6.2.1
PSEdition                      Core
GitCommitId                    6.2.1
OS                             Microsoft Windows 10.0.17763
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

-------------------------------------------------
func --version
2.7.1373

'Add-Type' doesn't work in applications that host powershell #9587

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