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# Connect to Azure
Connect-AzAccount

# Connect to Azure with MFA
Connect-AzAccount -TenantId <Tenant Id>
# Set Subscription Context
Set-AzContext -Subscription "<Subscription>"
# Register Provider
Register-AzResourceProvider -ProviderNamespace Microsoft.Kubernetes
Register-AzResourceProvider -ProviderNamespace Microsoft.KubernetesConfiguration
Register-AzResourceProvider -ProviderNamespace Microsoft.ExtendedLocation
# Connect to Azure Arc using the Aks-Hci PowerShell module
Enable-AksHciArcConnection -name <clustername>

References:

Connect an Azure Kubernetes Service on Azure Stack HCI cluster to Azure Arc-enabled Kubernetes - AKS-HCI
Connect an Azure Kubernetes Service on Azure Stack HCI cluster to Azure Arc-enabled Kubernetes