Hello @arkiboys ,
Thanks for the question and using MS Q&A platform.
Step1: Before you create the Azure Key Vault secret, you need to test the connection with the details provided (Server Name, Database Name, User Name and Password).

Step2: In Azure Key Vault, create a secret:
- Name: OnPremiseSQL
- Value: server=<computer_name>\<instance_name>;database=<database_name>;user=<User_name>;password=<Password>
Sample On-premise SQL Server Connection String: server=CHPRADEEP;database=master;user=azure;password=password@12345

Step3 Let create the on-premise linked service using the secret created in the Azure Key Vault.

Hope this will help. Please let us know if any further queries.
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