Hi @kumar kaushal ,
infos how to move Azure resources between 2 different tenants is described here: https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/move-resource-group-and-subscription
Behind the scenes, as far as I know, its managed by Azure Resource Manager.
What exactly happens during the move isn't documented well. Or I haven't found it so far.
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Regards
Andreas Baumgarten