az vmss extension set & diagnostics set has problem

> ### `az feedback` auto-generates most of the information requested below, as of CLI version 2.0.62

**Describe the bug**

az vmss diagnostics set --resource-group MC_adadilli_adadilliMC_eastus2euap --vmss-name aks-agentpool-26747325-vmss --protected-settings protected.json --settings config.json
Deployment failed. Correlation ID: 0dea0b10-90c1-4738-9c16-5622f6d7d074. VM has reported a failure when processing extension 'LinuxDiagnostic'. Error message: "Extension operation Enable failed:Settings did not contain protectedSettings. For information on protected settings, visit https://docs.microsoft.com/en-us/azure/virtual-machines/extensions/diagnostics-linux#protected-settings."

More information on troubleshooting is available at https://aka.ms/VMExtensionLinuxDiagnosticsTroubleshoot
Let me know if you need more context

**To Reproduce**

**Expected behavior**

**Environment summary**

**Additional context**