AKS Nodepool Upgrade Failed with Azure Activity Log "Operation timeout, please retry."

1/17/2020

I am attempting to upgrade AKS Kubernetes version from 1.15.3 to 1.15.7. I have successfully upgraded the Control Plane and a nodepool, however the second nodepool isn't upgrading. I've used az aks nodepool list and can see "provisioningState": "Failed". The Azure Activity Log shows Operation timeout, please retry. as the cause.

What could be causing the failure?
Are there any logs in Log Analytics to see the cause of the failure?

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azure-container-service

azure-kubernetes

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