diff --git a/apiserver/plane/authentication/adapter/base.py b/apiserver/plane/authentication/adapter/base.py
index 7b899e63c..5876e934f 100644
--- a/apiserver/plane/authentication/adapter/base.py
+++ b/apiserver/plane/authentication/adapter/base.py
@@ -4,6 +4,8 @@ import uuid
 
 # Django imports
 from django.utils import timezone
+from django.core.validators import validate_email
+from django.core.exceptions import ValidationError
 
 # Third party imports
 from zxcvbn import zxcvbn
@@ -46,68 +48,71 @@ class Adapter:
     def authenticate(self):
         raise NotImplementedError
 
-    def complete_login_or_signup(self):
-        email = self.user_data.get("email")
-        user = User.objects.filter(email=email).first()
-        # Check if sign up case or login
-        is_signup = bool(user)
-        if not user:
-            # New user
-            (ENABLE_SIGNUP,) = get_configuration_value(
-                [
-                    {
-                        "key": "ENABLE_SIGNUP",
-                        "default": os.environ.get("ENABLE_SIGNUP", "1"),
-                    },
-                ]
-            )
-            if (
-                ENABLE_SIGNUP == "0"
-                and not WorkspaceMemberInvite.objects.filter(
-                    email=email,
-                ).exists()
-            ):
-                raise AuthenticationException(
-                    error_code=AUTHENTICATION_ERROR_CODES["SIGNUP_DISABLED"],
-                    error_message="SIGNUP_DISABLED",
-                    payload={"email": email},
-                )
-            user = User(email=email, username=uuid.uuid4().hex)
-
-            if self.user_data.get("user").get("is_password_autoset"):
-                user.set_password(uuid.uuid4().hex)
-                user.is_password_autoset = True
-                user.is_email_verified = True
-            else:
-                # Validate password
-                results = zxcvbn(self.code)
-                if results["score"] < 3:
-                    raise AuthenticationException(
-                        error_code=AUTHENTICATION_ERROR_CODES[
-                            "INVALID_PASSWORD"
-                        ],
-                        error_message="INVALID_PASSWORD",
-                        payload={"email": email},
-                    )
-
-                user.set_password(self.code)
-                user.is_password_autoset = False
-
-            avatar = self.user_data.get("user", {}).get("avatar", "")
-            first_name = self.user_data.get("user", {}).get("first_name", "")
-            last_name = self.user_data.get("user", {}).get("last_name", "")
-            user.avatar = avatar if avatar else ""
-            user.first_name = first_name if first_name else ""
-            user.last_name = last_name if last_name else ""
-            user.save()
-            Profile.objects.create(user=user)
-
-        if not user.is_active:
+    def sanitize_email(self, email):
+        # Check if email is present
+        if not email:
             raise AuthenticationException(
-                AUTHENTICATION_ERROR_CODES["USER_ACCOUNT_DEACTIVATED"],
-                error_message="USER_ACCOUNT_DEACTIVATED",
+                error_code=AUTHENTICATION_ERROR_CODES["INVALID_EMAIL"],
+                error_message="INVALID_EMAIL",
+                payload={"email": email},
             )
 
+        # Sanitize email
+        email = str(email).lower().strip()
+
+        # validate email
+        try:
+            validate_email(email)
+        except ValidationError:
+            raise AuthenticationException(
+                error_code=AUTHENTICATION_ERROR_CODES["INVALID_EMAIL"],
+                error_message="INVALID_EMAIL",
+                payload={"email": email},
+            )
+        # Return email
+        return email
+
+    def validate_password(self, email):
+        """Validate password strength"""
+        results = zxcvbn(self.code)
+        if results["score"] < 3:
+            raise AuthenticationException(
+                error_code=AUTHENTICATION_ERROR_CODES["INVALID_PASSWORD"],
+                error_message="INVALID_PASSWORD",
+                payload={"email": email},
+            )
+        return
+
+    def __check_signup(self, email):
+        """Check if sign up is enabled or not and raise exception if not enabled"""
+
+        # Get configuration value
+        (ENABLE_SIGNUP,) = get_configuration_value(
+            [
+                {
+                    "key": "ENABLE_SIGNUP",
+                    "default": os.environ.get("ENABLE_SIGNUP", "1"),
+                },
+            ]
+        )
+
+        # Check if sign up is disabled and invite is present or not
+        if (
+            ENABLE_SIGNUP == "0"
+            and not WorkspaceMemberInvite.objects.filter(
+                email=email,
+            ).exists()
+        ):
+            # Raise exception
+            raise AuthenticationException(
+                error_code=AUTHENTICATION_ERROR_CODES["SIGNUP_DISABLED"],
+                error_message="SIGNUP_DISABLED",
+                payload={"email": email},
+            )
+
+        return True
+
+    def save_user_data(self, user):
         # Update user details
         user.last_login_medium = self.provider
         user.last_active = timezone.now()
@@ -116,7 +121,63 @@ class Adapter:
         user.last_login_uagent = self.request.META.get("HTTP_USER_AGENT")
         user.token_updated_at = timezone.now()
         user.save()
+        return user
 
+    def complete_login_or_signup(self):
+        # Get email
+        email = self.user_data.get("email")
+
+        # Sanitize email
+        email = self.sanitize_email(email)
+
+        # Check if the user is present
+        user = User.objects.filter(email=email).first()
+        # Check if sign up case or login
+        is_signup = bool(user)
+        # If user is not present, create a new user
+        if not user:
+            # New user
+            self.__check_signup(email)
+
+            # Initialize user
+            user = User(email=email, username=uuid.uuid4().hex)
+
+            # Check if password is autoset
+            if self.user_data.get("user").get("is_password_autoset"):
+                user.set_password(uuid.uuid4().hex)
+                user.is_password_autoset = True
+                user.is_email_verified = True
+
+            # Validate password
+            else:
+                # Validate password
+                self.validate_password(email)
+                # Set password
+                user.set_password(self.code)
+                user.is_password_autoset = False
+
+            # Set user details
+            avatar = self.user_data.get("user", {}).get("avatar", "")
+            first_name = self.user_data.get("user", {}).get("first_name", "")
+            last_name = self.user_data.get("user", {}).get("last_name", "")
+            user.avatar = avatar if avatar else ""
+            user.first_name = first_name if first_name else ""
+            user.last_name = last_name if last_name else ""
+            user.save()
+
+            # Create profile
+            Profile.objects.create(user=user)
+
+        if not user.is_active:
+            raise AuthenticationException(
+                AUTHENTICATION_ERROR_CODES["USER_ACCOUNT_DEACTIVATED"],
+                error_message="USER_ACCOUNT_DEACTIVATED",
+            )
+
+        # Save user data
+        user = self.save_user_data(user=user)
+
+        # Call callback if present
         if self.callback:
             self.callback(
                 user,
@@ -124,7 +185,9 @@ class Adapter:
                 self.request,
             )
 
+        # Create or update account if token data is present
         if self.token_data:
             self.create_update_account(user=user)
 
+        # Return user
         return user
diff --git a/apiserver/plane/authentication/adapter/error.py b/apiserver/plane/authentication/adapter/error.py
index 7b12db945..55ff10988 100644
--- a/apiserver/plane/authentication/adapter/error.py
+++ b/apiserver/plane/authentication/adapter/error.py
@@ -58,6 +58,8 @@ AUTHENTICATION_ERROR_CODES = {
     "ADMIN_USER_DEACTIVATED": 5190,
     # Rate limit
     "RATE_LIMIT_EXCEEDED": 5900,
+    # Unknown
+    "AUTHENTICATION_FAILED": 5999,
 }
 
 
diff --git a/apiserver/plane/authentication/adapter/oauth.py b/apiserver/plane/authentication/adapter/oauth.py
index a917c002a..b1a92e79e 100644
--- a/apiserver/plane/authentication/adapter/oauth.py
+++ b/apiserver/plane/authentication/adapter/oauth.py
@@ -81,11 +81,11 @@ class OauthAdapter(Adapter):
             response.raise_for_status()
             return response.json()
         except requests.RequestException:
-            code = (
-                "GOOGLE_OAUTH_PROVIDER_ERROR"
-                if self.provider == "google"
-                else "GITHUB_OAUTH_PROVIDER_ERROR"
-            )
+            if self.provider == "google":
+                code = "GOOGLE_OAUTH_PROVIDER_ERROR"
+            if self.provider == "github":
+                code = "GITHUB_OAUTH_PROVIDER_ERROR"
+
             raise AuthenticationException(
                 error_code=AUTHENTICATION_ERROR_CODES[code],
                 error_message=str(code),