error while overriding 'Password2' parameter because of 'SyntaxError

Seems you need to take care of the following

• Backslashes in JSON must be escaped twice if you're embedding them in a string inside a JSON object.
• If you're using a deployment command or script (like Azure CLI or PowerShell), the escaping rules may differ depending on the shell.

If you're manually overriding parameters using a JSON file or inline JSON, the password should look like this:

"Password2": {
  "reference": {
    "keyVault": {
      "id": "/subscriptions/.../resourceGroups/.../providers/Microsoft.KeyVault/vaults/yourVault"
    },
    "secretName": "yourSecretName"
  }
}

• \\ becomes \\\\ in JSON because each backslash must be escaped.
• If you're using a command-line tool, you may need additional escaping depending on the shell (e.g., PowerShell vs Bash).