Hi Basamnath , Welcome to MS Q&A
Based on this thread thread,
I think you are using the vision studio settings page to create your resource. On this page, as seen in the screenshot it tries to pull the resource groups which already have an "Azure AI services multi-service account" resource created in the resource group. This limits the resource groups that are listed and the only way you can use this option is to use a resource group which already has "Azure AI services multi-service account" resource created in it.
I would recommend using the Azure portal itself to create an AI vision resource in the resource group of your choice and then use the settings page on vision studio to map your vision studio to this resource. I hope this helps!!
For example, I have one RG where I have "Azure AI services multi-service account"
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