Could not deserialize Json Text

[NWessel]

I might be doing something wrong or misunderstanding how to use Rebus - I'm trying to receieve a message from Dataverse (Microsoft product) through the azure service bus, through a topic.

It might be a simple thing im missing..

I have the following code

DI

Subscribe to topic

Handle message (I've tried creating a class, using a string, object and now jsonnode - they all failed with similar error)

I get the following error message

System.FormatException: Could not deserialize JSON text: '{"BusinessUnitId":"0f803ca6-c335-ef11-840a-000d3a25a1a8","CorrelationId":"292f1ed9-9197-4d43-92be-3217ad383d54","Depth":1,"InitiatingUserAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/134.0.0.0 Safari\/537.36 Edg\/134.0.0.0","InitiatingUserAzureActiveDirectoryObjectId":"b8dce20e-5d6e-4e7a-86f3-320550c914f3","InitiatingUserId":"9f873ca6-c335-ef11-840a-000d3a25a1a8","InputParameters":[{"key":"Target","value":{"__type":"Entity:http:\/\/schemas.microsoft.com\/xrm\/2011\/Contracts","Attributes":[{"key":"pum_name","value":"Test financials December 2024s"},{"key":"pum_initiativeid","value":"1c55a645-ad97-4f7d-8889-a3f93ff0dd34"},{"key":"modifiedon","value":"\/Date(1741679163000)\/"},{"key":"modifiedby","value":{"__type":"EntityReference:http:\/\/schemas.microsoft.com\/xrm\/2011\/Contracts","Id":"9f873ca6-c335-ef11-840a-000d3a25a1a8","KeyAttributes":[],"LogicalName":"systemuser","Name":null,"RowVersion":null}},{"key":"modifiedonbehalfby","value":null}],"EntityState":null,"FormattedValues":[],"Id":"1c55a645-ad97-4f7d-8889-a3f93ff0dd34","KeyAttributes":[],"LogicalName":"pum_initiative","RelatedEntities":[],"RowVersion":"4754260"}}],"IsExecutingOffline":false,"IsInTransaction":false,"IsOfflinePlayback":false,"IsolationMode":1,"MessageName":"Update","Mode":1,"OperationCreatedOn":"\/Date(1741679168000+0000)\/","OperationId":"c82d3be3-4cfe-ef11-bae3-00224880df6d","OrganizationId":"9a786e6b-2739-ef11-8e4b-000d3a4b6756","OrganizationName":"unq9a786e6b2739ef118e4b000d3a4b6","OutputParameters":[],"OwningExtension":{"Id":"7bc60dfb-9ee9-4770-8a7d-eb6683e2dc34","KeyAttributes":[],"LogicalName":"sdkmessageprocessingstep","Name":null,"RowVersion":null},"ParentContext":{"BusinessUnitId":"0f803ca6-c335-ef11-840a-000d3a25a1a8","CorrelationId":"292f1ed9-9197-4d43-92be-3217ad383d54","Depth":1,"InitiatingUserAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/134.0.0.0 Safari\/537.36 Edg\/134.0.0.0","InitiatingUserAzureActiveDirectoryObjectId":"b8dce20e-5d6e-4e7a-86f3-320550c914f3","InitiatingUserId":"9f873ca6-c335-ef11-840a-000d3a25a1a8","InputParameters":[{"key":"Target","value":{"__type":"Entity:http:\/\/schemas.microsoft.com\/xrm\/2011\/Contracts","Attributes":[{"key":"pum_name","value":"Test financials December 2024s"},{"key":"pum_initiativeid","value":"1c55a645-ad97-4f7d-8889-a3f93ff0dd34"}],"EntityState":null,"FormattedValues":[],"Id":"1c55a645-ad97-4f7d-8889-a3f93ff0dd34","KeyAttributes":[],"LogicalName":"pum_initiative","RelatedEntities":[],"RowVersion":null}},{"key":"x-ms-app-name","value":"pum_PowerPPMEssentials"},{"key":"SuppressDuplicateDetection","value":false}],"IsExecutingOffline":false,"IsInTransaction":false,"IsOfflinePlayback":false,"IsolationMode":1,"MessageName":"Update","Mode":1,"OperationCreatedOn":"\/Date(1741679168000+0000)\/","OperationId":"c82d3be3-4cfe-ef11-bae3-00224880df6d","OrganizationId":"9a786e6b-2739-ef11-8e4b-000d3a4b6756","OrganizationName":"unq9a786e6b2739ef118e4b000d3a4b6","OutputParameters":[],"OwningExtension":{"Id":"7bc60dfb-9ee9-4770-8a7d-eb6683e2dc34","KeyAttributes":[],"LogicalName":"sdkmessageprocessingstep","Name":null,"RowVersion":null},"ParentContext":null,"PostEntityImages":[],"PreEntityImages":[],"PrimaryEntityId":"1c55a645-ad97-4f7d-8889-a3f93ff0dd34","PrimaryEntityName":"pum_initiative","RequestId":"4621ef1a-792c-4197-9ee9-eea553971599","SecondaryEntityName":"none","SharedVariables":[{"key":"IsAutoTransact","value":true},{"key":"AcceptLang","value":"en-US,en;q=0.9"},{"key":"x-ms-app-name","value":"pum_PowerPPMEssentials"},{"key":"ChangedEntityTypes","value":[{"__type":"KeyValuePairOfstringstring:#System.Collections.Generic","key":"pum_dependency","value":"Update"},{"__type":"KeyValuePairOfstringstring:#System.Collections.Generic","key":"pum_initiative","value":"Update"},{"__type":"KeyValuePairOfstringstring:#System.Collections.Generic","key":"fileattachment","value":"Create"}]}],"Stage":30,"UserAzureActiveDirectoryObjectId":"b8dce20e-5d6e-4e7a-86f3-320550c914f3","UserId":"9f873ca6-c335-ef11-840a-000d3a25a1a8"},"PostEntityImages":[{"key":"AsynchronousStepPrimaryName","value":{"Attributes":[{"key":"pum_name","value":"Test financials December 2024s"},{"key":"pum_initiativeid","value":"1c55a645-ad97-4f7d-8889-a3f93ff0dd34"}],"EntityState":null,"FormattedValues":[],"Id":"1c55a645-ad97-4f7d-8889-a3f93ff0dd34","KeyAttributes":[],"LogicalName":"pum_initiative","RelatedEntities":[],"RowVersion":null}}],"PreEntityImages":[],"PrimaryEntityId":"1c55a645-ad97-4f7d-8889-a3f93ff0dd34","PrimaryEntityName":"pum_initiative","RequestId":"4621ef1a-792c-4197-9ee9-eea553971599","SecondaryEntityName":"none","SharedVariables":[{"key":"IsAutoTransact","value":true},{"key":"AcceptLang","value":"en-US,en;q=0.9"},{"key":"x-ms-app-name","value":"pum_PowerPPMEssentials"}],"Stage":40,"UserAzureActiveDirectoryObjectId":"b8dce20e-5d6e-4e7a-86f3-320550c914f3","UserId":"9f873ca6-c335-ef11-840a-000d3a25a1a8"}' ---> System.ArgumentNullException: Value cannot be null. (Parameter 'returnType') at System.Text.Json.ThrowHelper.ThrowArgumentNullException(String parameterName) at System.Text.Json.JsonSerializer.Deserialize(ReadOnlySpan1 utf8Json, Type returnType, JsonSerializerOptions options)
at Rebus.Serialization.Json.SystemTextJsonSerializer.DeserializeUtf8(Byte[] body, Type type)
--- End of inner exception stack trace ---
at Rebus.Serialization.Json.SystemTextJsonSerializer.DeserializeUtf8(Byte[] body, Type type)
at Rebus.Serialization.Json.SystemTextJsonSerializer.GetMessage(TransportMessage transportMessage, Encoding bodyEncoding)
at Rebus.Serialization.Json.SystemTextJsonSerializer.Deserialize(TransportMessage transportMessage)
at Rebus.Compression.UnzippingSerializerDecorator.Deserialize(TransportMessage transportMessage)
at Rebus.Pipeline.Receive.DeserializeIncomingMessageStep.Process(IncomingStepContext context, Func1 next) at Rebus.DataBus.ClaimCheck.HydrateIncomingMessageStep.Process(IncomingStepContext context, Func1 next)
at Rebus.Retry.Simple.DefaultRetryStep.Process(IncomingStepContext context, Func1 next)