The plug-in execution failed because no Sandbox Worker processes are currently available

📌 Overview

Microsoft Dynamics 365 CRM uses a sandbox environment to execute plug-ins that run in an isolated mode. The error message "The plug-in execution failed because no Sandbox Worker processes are currently available" indicates that the system could not allocate a worker process to execute the plug-in.

❗ Possible Causes

🔹 High System Load: The CRM environment may be experiencing heavy processing demand, leading to a shortage of available sandbox worker processes.

🚨 Service Outages: The Dynamics 365 online service might be experiencing temporary issues or downtime.

📉 Insufficient Resources: The allocated sandbox workers might be overloaded due to multiple plug-ins, workflows, or other background processes.

🐢 Long-Running Plug-ins: If a plug-in takes too long to execute, it may block available sandbox workers.

⚠️ Misconfigured or Faulty Plug-in Code: Poorly written plug-ins with infinite loops or resource-heavy operations may cause sandbox worker exhaustion.

🔄 Multiple Concurrent Plug-ins: When multiple plug-ins execute simultaneously, they compete for limited sandbox workers.

🛠️ CRM Updates or Maintenance Activities: Microsoft may be performing updates, leading to temporary unavailability of sandbox workers.

🔍 Troubleshooting Steps

🔹 Step 1: Check Service Health

• 🌐 Navigate to the Microsoft Service Health Dashboard (🔗 Link) to check if there are any known issues affecting Dynamics 365.

🔹 Step 2: Review Plug-in Execution Logs

• 📂 Open Power Platform Admin Center and navigate to Plug-in Trace Logs.
• 📊 Look for any excessive execution times or errors in plug-in execution.

🔹 Step 3: Identify Resource Bottlenecks

• 📌 Check the System Jobs section in Dynamics 365 to see if there are any pending or failed plug-in executions.
• ⚡ Identify any plug-ins that are consuming excessive resources.

🔹 Step 4: Optimize Plug-in Code

• ✅ Ensure that plug-ins are optimized and do not perform long-running or resource-heavy operations.
• 🚀 Move non-critical operations to Azure Functions or Power Automate Flows.
• 🔄 Consider asynchronous execution instead of synchronous where possible.

🔹 Step 5: Restart the Sandbox Service (On-Premise Only)

For on-premise environments:

• 🔄 Restart the Microsoft.Crm.Sandbox.HostService service in the Windows Services console.
• 📈 Monitor for improvements after the restart.

🔹 Step 6: Increase Sandbox Worker Capacity (For High Workloads)

• 📊 If running in an on-premise environment, add additional sandbox workers to handle more concurrent plug-ins.
• 📞 For online environments, consider reaching out to Microsoft Support to discuss scaling options.

🔹 Step 7: Contact Microsoft Support

If the issue persists, open a support ticket with Microsoft:

• 📞 Navigate to Power Platform Admin Center > Help + Support > New Support Request.
• 📝 Provide details such as affected plug-ins, error logs, and timestamps of occurrences.

🎯 Conclusion

This error is typically caused by resource limitations or service outages. By following the above steps—checking system health, reviewing logs, optimizing plug-in execution, and ensuring sufficient sandbox capacity—you can mitigate and resolve this issue effectively. If the problem continues, reaching out to Microsoft Support is recommended for further assistance.

🔹 Stay proactive in monitoring plug-in executions and optimizing performance to prevent future occurrences! 🚀