Not able to register any custom code activity/Plugin in isolation mode sandbox

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Posted on by Abanoub_D365

Facing and getting this error msg during the registeration of the custom code activity in isloation mode sandbox while trying to registering it in "None" is working fine what I need to find the trace logs even though the tracing is enabled for all and after a huge search find-out on the on prem v9.1 what is logged on the trace logs is plugins and custom code activity which are registered on "Sandbox"

For the exception Details

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=9.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Exception retrieving custom activity info using SandboxPlugin - Unhandled exception:
Exception type: Microsoft.Crm.CrmException
Message: Unable to retrieve customActivityInfo using RetrieveCustomActivityInfoWithSandboxPlugin.
at Microsoft.Crm.Workflow.ObjectModel.CustomActivityInfoMetadataBase.GetCustomActivityInfo(ActivityInfo activityInfo, Int32 isolationMode, Guid pluginAssemblyId)
-- End stack trace --

Detail: <OrganizationServiceFault xmlns="http://schemas.microsoft.com/xrm/2011/Contracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<ActivityId>d804b910-cfcf-4a62-8cde-a1a32210a402</ActivityId>
<ErrorCode>-2147200934</ErrorCode>
<ErrorDetails xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic">
<KeyValuePairOfstringanyType>
<a:key>ApiExceptionSourceKey</a:key>
<a:value i:type="b:string" xmlns:b="http://www.w3.org/2001/XMLSchema">Plugin/Microsoft.Crm.ObjectModel.PluginTypeService</a:value>
</KeyValuePairOfstringanyType>
<KeyValuePairOfstringanyType>
<a:key>ApiOriginalExceptionKey</a:key>
<a:value i:type="b:string" xmlns:b="http://www.w3.org/2001/XMLSchema">Microsoft.Crm.CrmException: Exception retrieving custom activity info using SandboxPlugin - Unhandled exception:
Exception type: Microsoft.Crm.CrmException
Message: Unable to retrieve customActivityInfo using RetrieveCustomActivityInfoWithSandboxPlugin.
at Microsoft.Crm.Workflow.ObjectModel.CustomActivityInfoMetadataBase.GetCustomActivityInfo(ActivityInfo activityInfo, Int32 isolationMode, Guid pluginAssemblyId)
-- End stack trace --

---> Microsoft.Crm.CrmException: Exception retrieving custom activity info using SandboxPlugin - Unhandled exception:
Exception type: Microsoft.Crm.CrmException
Message: Unable to retrieve customActivityInfo using RetrieveCustomActivityInfoWithSandboxPlugin.
at Microsoft.Crm.Workflow.ObjectModel.CustomActivityInfoMetadataBase.GetCustomActivityInfo(ActivityInfo activityInfo, Int32 isolationMode, Guid pluginAssemblyId)
-- End stack trace --

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Abanoub_D365 93 on at

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Not able to register any custom code activity/Plugin in isolation mode sandbox

Now, after setting the appropriate logged-in service account user for the sandbox service able to register the sandbox plugin

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Abanoub_D365 93 on at

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Not able to register any custom code activity/Plugin in isolation mode sandbox

Hi Holly,
appreciated your reply BTW the assembly definitely is signed and I've reviewed the code It's very simple I'm just trying to add or register any sandbox custom code activity after many trials registering the plugin worked meanwhile tracing is enabled on it however I am facing another issue related to not able to see any trace logs and I'm registering by the service admin account

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Holly Huffman 6,520 Super User 2025 Season 2 on at

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Not able to register any custom code activity/Plugin in isolation mode sandbox

It sounds like you're encountering an issue with registering custom code activities or plugins in isolation mode (sandbox) in Dynamics 365. Here are some steps you can take to troubleshoot and resolve this issue:

Ensure that the plugin assembly is correctly signed and that all dependencies are included. Verify that the assembly is compatible with the sandbox environment.

Review Plugin Code: Check the plugin code for any operations that are not allowed in the sandbox environment, such as accessing the file system or making external network calls.

Enable Tracing: Enable tracing for the plugin to capture detailed logs. You can do this by setting the TracingService in your plugin code. Review the trace logs to identify any specific errors or issues.

Check Security Roles: Ensure that the user registering the plugin has the necessary security roles and permissions to register plugins in the sandbox environment.

Review Isolation Mode Settings: Verify that the isolation mode is set to "Sandbox" in the Plugin Registration Tool. Ensure that the plugin is registered correctly with the appropriate isolation mode.

Consult Documentation and Community: Refer to the for guidelines on registering plugins in the sandbox environment.

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