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Symptoms
When you try to upgrade or scale a Microsoft Azure Kubernetes Service (AKS) cluster, you might receive the "Changing property 'imageReference' is not allowed" error message.
Cause
Unexpected results might occur if you modify or delete tags and other properties of resources within the MC_* resource group. Also, altering the resources within the MC_* group in the AKS cluster will break the service-level objective (SLO).
Solution
Add another node pool, and then delete the affected node pool.
Contact us for help
If you have questions, you can ask Azure community support. You can also submit product feedback to Azure feedback community.