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Azure - "VMScaleSetCannotReferenceLoadbalancerWhenLargeScaleIsEnabled"

'VM scale set cannot reference a load balancer when LargeScale property is enabled.'

The error may well leave you as puzzled as I was!

There is a checklist of things you require

/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-placement-groups

STANDARD not BASIC for the Load-Balancer is the first thing to check..

/en-us/azure/virtual-network/virtual-network-ip-addresses-overview-arm

and you probably need a Standard SKU for your Public IP too.