Error "BadDecodingError" while passing a custom ExtensionObject to a CallMethod to RegisterApplication with GlobalDiscoveryServer

[Dipp3r]

I'm defining a struct for the custom ExtensionObject and registering it during runtime with the appropriate NodeId and Data structure as specified in UAExpert:

ApplicationRecordDataType

type ApplicationRecordDataType struct {
	ApplicationId      *ua.NodeID
	ApplicationUri     string
	ApplicationType    ua.ApplicationType
	ApplicationNames   []*ua.LocalizedText
	ProductUri         string
	DiscoveryUrls      []string
	ServerCapabilities []string
}

func init() {
	ua.RegisterExtensionObject(ua.NewNumericNodeID(3, 1), new(ApplicationRecordDataType))
}

When I call the Method "RegisterApplication" (objectId: "ns=3,i=141", methodId: "ns=3,i=146") after connecting to a GDS server, with InputArguments set to an instance of ApplicationRecordDataType , I'm receiving an Error BadInvalidArgument | 0x80ab0000 | 2158690304 | One or more arguments are invalid

Below is the code for your reference:

func getApplicationRecordDataType() ApplicationRecordDataType {
	return ApplicationRecordDataType{
		ApplicationId:   ua.NewNumericNodeID(0, 0),
		ApplicationUri:  "urn:example:application:uri",
		ApplicationType: ua.ApplicationTypeServer,
		ApplicationNames: []*ua.LocalizedText{
			ua.NewLocalizedTextWithLocale("random text", "en-US"),
		},
		ProductUri:         "urn:example:product:uri",
		DiscoveryUrls:      []string{"opc.tcp://example.com:4840"},
		ServerCapabilities: []string{"LDS", "DA"},
	}
}

appRecord := getApplicationRecordDataType()
req := &ua.CallMethodRequest{
		ObjectID:       ua.NewNumericNodeID(3, 141),
		MethodID:       ua.NewNumericNodeID(3, 146),
		InputArguments: []*ua.Variant{ua.MustVariant(ua.NewExtensionObject(appRecord))},
	}

resp, err := c.Call(ctx, req)

Before this approach I also tried overwriting the variant.go file to accept ApplicationRecordDataType as a built-in type and passed appRecord without converting it into an ExtensionObject like:

appRecord := getApplicationRecordDataType()
req := &ua.CallMethodRequest{
		ObjectID:       ua.NewNumericNodeID(3, 141),
		MethodID:       ua.NewNumericNodeID(3, 146),
		InputArguments: []*ua.Variant{ua.MustVariant(appRecord)},
}

This resulted in BadDecodingError | 0x80070000 | 2147942400 | Decoding halted because of invalid data in the stream. Method call works alright with functions that accept simple built-in datatypes as inputArguments, maybe I'm just not structuring the data in the right way. It'd be great if someone could help me resolve this. Thanks in advance!