My AKS cluster shows a flag which states that it is in a failed state, even if the cluster itself does not show any sign of malfunction.

I could create a new one, but avoiding it would be nice.

Could the matter be related to the use of a virtual node kublet? I used it when still was in preview.

EDIT: the problem is all there. There is no special action which triggers the error, it just appears fixed at the top of the overview page (and consequently I am stopped to perform specific actions).