Update TX automation quickstart

getting-started/signing-automation-quickstart.mdx

@@ -37,6 +37,12 @@ Create a new key named `quickstart` using the turnkey CLI:
 turnkey generate api-key --organization $ORGANIZATION_ID --key-name quickstart
 ```
 
+Create a new encryption key using the turnkey CLI:
+
+```bash
+turnkey generate encryption-key --organization $ORGANIZATION_ID --user $USER_ID
+```
+
 You'll see output like this:
 
 ```json
@@ -59,7 +65,7 @@ turnkey wallets create --name default --key-name quickstart
 ```
 
 <Note>
-  This command requires a key named `quickstart` to exist in your configuration. This key should have been created during the [Quickstart](/getting-started/quickstart) guide. If you haven't created it yet, please complete the initial setup steps first.
+  This command requires a key named `quickstart` to exist in your configuration. This key should have been created during the [Quickstart](/getting-started/quickstart) guide. It also requires you to create an encryption key named "default" which you'd find in the encryption-keys directory of your turnkey config. If you haven't created those yet, please complete the initial setup steps first.
 
 If the key doesn't exist, you'll see an error like this:
 
@@ -77,6 +83,14 @@ If the key exists but has not been added to your organization, you'll see an err
 }
 ```
 
+If the encryption key doesn't exist, you'll see an error like this:
+
+```json
+{
+  "error": "failed to associate the API key with an organization; please manually specify the organization ID"
+}
+```
+
 </Note>
 </Step>
 <Step title="Create Ethereum Account">