ADLS Gen 2 Connection creation using Fabric REST API

Hi rahul-biswas_le,

Thank you for reaching out in Microsoft Community Forum.

providing the documents which might you assist you in creating a connection to ADLS Gen 2 using Fabric Rest API.
Azure Data Lake Storage Gen2 REST API reference - Azure Storage | Microsoft Learn
Set up your Azure Data Lake Storage Gen2 connection - Microsoft Fabric | Microsoft Learn


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Regards,
Pavan.

Here is the sample request body that worked for me with Workspace Identity as authentication. 
Try changing the auth to SPN in your case. Hope this helps.

{
	"displayName": "FHE_TestEndPoint",
	"connectivityType": "ShareableCloud",
	"connectionDetails": {
		"creationMethod": "AzureDataLakeStorage",
		"type": "AzureDataLakeStorage",
		"parameters": [
			{
				"dataType": "Text",
				"name": "server",
				"value": "https://sampleadls.dfs.core.windows.net"
			},
			{
				"dataType": "Text",
				"name": "path",
				"value": "sampleadlscontainer"
			}
		]
	},
	"privacyLevel": "Organizational",
	"credentialDetails": {
		"credentials": {
			"credentialType": "WorkspaceIdentity"
		},
		"connectionEncryption": "NotEncrypted",
		"skipTestConnection": false,
		"singleSignOnType": "None"
	},
	"allowDatasourceThroughGateway": false
}