adding team id details

Author: harsh62

src/pages/[platform]/build-a-backend/auth/advanced-workflows/index.mdx

@@ -381,7 +381,7 @@ func federateToIdentityPoolsUsingCustomIdentityId() async throws {
 
 To use a shared keychain:
 
-1. In Xcode, go to Project Settings → Signing & Capabilities
+1. In Xcode, go to Project Settings → Your Target → Signing & Capabilities
 2. Click +Capability
 3. Add Keychain Sharing capability
 4. Add a keychain group
@@ -390,7 +390,7 @@ To use a shared keychain:
 To move to the shared keychain using this new keychain access group, specify the accessGroup parameter when instantiating the `AWSCognitoAuthPlugin`. If a user is currently signed-in, they will be logged out when first using the access group:
 
 ```swift
-let accessGroup = AccessGroup(name: "\(teamID).com.example.sharedItems")
+let accessGroup = AccessGroup(name: "\(teamID)com.example.sharedItems")
 let secureStoragePreferences = AWSCognitoSecureStoragePreferences(
   accessGroup: accessGroup)
 try Amplify.add(
@@ -403,7 +403,7 @@ If you would prefer the user session to be migrated (which will allow the user t
 
 ```swift
 let accessGroup = AccessGroup(
-  name: "\(teamID).com.example.sharedItems",
+  name: "\(teamID)com.example.sharedItems",
   migrateKeychainItemsOfUserSession: true)
 let secureStoragePreferences = AWSCognitoSecureStoragePreferences(
   accessGroup: accessGroup)
@@ -421,8 +421,30 @@ To move to a different access group, update the name parameter of the AccessGrou
 
 ### Migrating from a Shared Keychain
 
-If you’d like to stop sharing state between this app and other apps, you can set the access group to be `AccessGroup.none` or `AccessGroup.none(migrateKeychainItemsOfUserSession: true)` if you’d like the session to be migrated.
+If you'd like to stop sharing state between this app and other apps, you can set the access group to be `AccessGroup.none` or `AccessGroup.none(migrateKeychainItemsOfUserSession: true)` if you'd like the session to be migrated.
 
+### Retrieving Team ID
+
+First, ensure your Info.plist has the `AppIdentifierPrefix` key:
+
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>AppIdentifierPrefix</key>
+    <string>$(AppIdentifierPrefix)</string>
+</dict>
+</plist>
+```
+
+Then, you can retrieve the team ID from your Info.plist:
+
+```swift
+guard let teamID = Bundle.main.infoDictionary?["AppIdentifierPrefix"] as? String else {
+    fatalError("AppIdentifierPrefix key not found in Info.plist")
+}
+```
 
 </InlineFilter>
 <InlineFilter filters={['javascript','react-native','angular','nextjs','react','vue']}>
@@ -834,5 +856,3 @@ Amplify.configure(awsconfig, {
 ## API reference
 
 For the complete API documentation for Authentication module, visit our [API Reference](https://aws-amplify.github.io/amplify-js/api/modules/aws_amplify.auth.html)
-
-</InlineFilter>