diff --git a/Assets/Scripts/Gameplay/GameState/ClientMainMenuState.cs b/Assets/Scripts/Gameplay/GameState/ClientMainMenuState.cs
index c1b2a691f..53da328ae 100644
--- a/Assets/Scripts/Gameplay/GameState/ClientMainMenuState.cs
+++ b/Assets/Scripts/Gameplay/GameState/ClientMainMenuState.cs
@@ -22,20 +22,31 @@ namespace Unity.BossRoom.Gameplay.GameState
     /// </remarks>
     public class ClientMainMenuState : GameStateBehaviour
     {
-        public override GameState ActiveState { get { return GameState.MainMenu; } }
-
-        [SerializeField] NameGenerationData m_NameGenerationData;
-        [SerializeField] LobbyUIMediator m_LobbyUIMediator;
-        [SerializeField] IPUIMediator m_IPUIMediator;
-        [SerializeField] Button m_LobbyButton;
-        [SerializeField] GameObject m_SignInSpinner;
-        [SerializeField] UIProfileSelector m_UIProfileSelector;
-        [SerializeField] UITooltipDetector m_UGSSetupTooltipDetector;
-
-        [Inject] AuthenticationServiceFacade m_AuthServiceFacade;
-        [Inject] LocalLobbyUser m_LocalUser;
-        [Inject] LocalLobby m_LocalLobby;
-        [Inject] ProfileManager m_ProfileManager;
+        public override GameState ActiveState => GameState.MainMenu;
+
+        [SerializeField]
+        NameGenerationData m_NameGenerationData;
+        [SerializeField]
+        LobbyUIMediator m_LobbyUIMediator;
+        [SerializeField]
+        IPUIMediator m_IPUIMediator;
+        [SerializeField]
+        Button m_LobbyButton;
+        [SerializeField]
+        GameObject m_SignInSpinner;
+        [SerializeField]
+        UIProfileSelector m_UIProfileSelector;
+        [SerializeField]
+        UITooltipDetector m_UGSSetupTooltipDetector;
+
+        [Inject]
+        AuthenticationServiceFacade m_AuthServiceFacade;
+        [Inject]
+        LocalLobbyUser m_LocalUser;
+        [Inject]
+        LocalLobby m_LocalLobby;
+        [Inject]
+        ProfileManager m_ProfileManager;
 
         protected override void Awake()
         {
@@ -61,17 +72,12 @@ protected override void Configure(IContainerBuilder builder)
             builder.RegisterComponent(m_IPUIMediator);
         }
 
-
         private async void TrySignIn()
         {
             try
             {
-                var unityAuthenticationInitOptions = new InitializationOptions();
-                var profile = m_ProfileManager.Profile;
-                if (profile.Length > 0)
-                {
-                    unityAuthenticationInitOptions.SetProfile(profile);
-                }
+                var unityAuthenticationInitOptions =
+                    m_AuthServiceFacade.GenerateAuthenticationOptions(m_ProfileManager.Profile);
 
                 await m_AuthServiceFacade.InitializeAndSignInAsync(unityAuthenticationInitOptions);
                 OnAuthSignIn();
@@ -92,6 +98,7 @@ private void OnAuthSignIn()
             Debug.Log($"Signed in. Unity Player ID {AuthenticationService.Instance.PlayerId}");
 
             m_LocalUser.ID = AuthenticationService.Instance.PlayerId;
+
             // The local LobbyUser object will be hooked into UI before the LocalLobby is populated during lobby join, so the LocalLobby must know about it already when that happens.
             m_LocalLobby.AddUser(m_LocalUser);
         }
@@ -103,6 +110,7 @@ private void OnSignInFailed()
                 m_LobbyButton.interactable = false;
                 m_UGSSetupTooltipDetector.enabled = true;
             }
+
             if (m_SignInSpinner)
             {
                 m_SignInSpinner.SetActive(false);
diff --git a/Assets/Scripts/Gameplay/UI/UIProfileSelector.cs b/Assets/Scripts/Gameplay/UI/UIProfileSelector.cs
index c6300cb38..7699605df 100644
--- a/Assets/Scripts/Gameplay/UI/UIProfileSelector.cs
+++ b/Assets/Scripts/Gameplay/UI/UIProfileSelector.cs
@@ -26,6 +26,9 @@ public class UIProfileSelector : MonoBehaviour
         [Inject] IObjectResolver m_Resolver;
         [Inject] ProfileManager m_ProfileManager;
 
+        // Authentication service only accepts profile names of 30 characters or under 
+        const int k_AuthenticationMaxProfileLength = 30;
+
         void Awake()
         {
             m_ProfileListItemPrototype.gameObject.SetActive(false);
@@ -44,7 +47,8 @@ public void SanitizeProfileNameInputText()
 
         string SanitizeProfileName(string dirtyString)
         {
-            return Regex.Replace(dirtyString, "[^a-zA-Z0-9]", "");
+            var output = Regex.Replace(dirtyString, "[^a-zA-Z0-9]", "");
+            return output[..Math.Min(output.Length, k_AuthenticationMaxProfileLength)];
         }
 
         public void OnNewProfileButtonPressed()
diff --git a/Assets/Scripts/UnityServices/Auth/AuthenticationServiceFacade.cs b/Assets/Scripts/UnityServices/Auth/AuthenticationServiceFacade.cs
index c8f8396aa..ef26eceeb 100644
--- a/Assets/Scripts/UnityServices/Auth/AuthenticationServiceFacade.cs
+++ b/Assets/Scripts/UnityServices/Auth/AuthenticationServiceFacade.cs
@@ -10,7 +10,28 @@ namespace Unity.BossRoom.UnityServices.Auth
 {
     public class AuthenticationServiceFacade
     {
-        [Inject] IPublisher<UnityServiceErrorMessage> m_UnityServiceErrorMessagePublisher;
+        [Inject]
+        IPublisher<UnityServiceErrorMessage> m_UnityServiceErrorMessagePublisher;
+
+        public InitializationOptions GenerateAuthenticationOptions(string profile)
+        {
+            try
+            {
+                var unityAuthenticationInitOptions = new InitializationOptions();
+                if (profile.Length > 0)
+                {
+                    unityAuthenticationInitOptions.SetProfile(profile);
+                }
+
+                return unityAuthenticationInitOptions;
+            }
+            catch (Exception e)
+            {
+                var reason = $"{e.Message} ({e.InnerException?.Message})";
+                m_UnityServiceErrorMessagePublisher.Publish(new UnityServiceErrorMessage("Authentication Error", reason, UnityServiceErrorMessage.Service.Authentication, e));
+                throw;
+            }
+        }
 
         public async Task InitializeAndSignInAsync(InitializationOptions initializationOptions)
         {
@@ -37,6 +58,7 @@ public async Task SwitchProfileAndReSignInAsync(string profile)
             {
                 AuthenticationService.Instance.SignOut();
             }
+
             AuthenticationService.Instance.SwitchProfile(profile);
 
             try
@@ -67,6 +89,7 @@ public async Task<bool> EnsurePlayerIsAuthorized()
             {
                 var reason = $"{e.Message} ({e.InnerException?.Message})";
                 m_UnityServiceErrorMessagePublisher.Publish(new UnityServiceErrorMessage("Authentication Error", reason, UnityServiceErrorMessage.Service.Authentication, e));
+
                 //not rethrowing for authentication exceptions - any failure to authenticate is considered "handled failure"
                 return false;
             }
@@ -78,6 +101,5 @@ public async Task<bool> EnsurePlayerIsAuthorized()
                 throw;
             }
         }
-
     }
 }
diff --git a/Assets/Scripts/Utils/ProfileManager.cs b/Assets/Scripts/Utils/ProfileManager.cs
index aa7c75713..466e60a8c 100644
--- a/Assets/Scripts/Utils/ProfileManager.cs
+++ b/Assets/Scripts/Utils/ProfileManager.cs
@@ -80,7 +80,9 @@ static string GetProfile()
             var hashedBytes = new MD5CryptoServiceProvider()
                 .ComputeHash(Encoding.UTF8.GetBytes(Application.dataPath));
             Array.Resize(ref hashedBytes, 16);
-            return new Guid(hashedBytes).ToString("N");
+            // Authentication service only allows profile names of maximum 30 characters. We're generating a GUID based
+            // on the project's path. Truncating the first 30 characters of said GUID string suffices for uniqueness.
+            return new Guid(hashedBytes).ToString("N")[..30];
 #else
             return "";
 #endif
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 13c130a4b..78ae0a7de 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ Additional documentation and release notes are available at [Multiplayer Documen
 * Replaced our custom pool implementation using queues with ObjectPool (#824)
 * Upgraded Boss Room to NGO 1.3.1 (#828) NetworkPrefabs inside NetworkManager's NetworkPrefabs list have been converted to NetworkPrefabsList ScriptableObject.
 * Upgraded Boss Room to NGO 1.4.0 (#829)
+* Profile names generated are now only 30 characters or under to fit Authentication Service requirements (#831)
 
 ### Cleanup
 * Clarified a TODO comment inside ClientCharacter, detailing how anticipation should only be executed on owning client players (#786)