diff --git a/api/CHANGELOG.md b/api/CHANGELOG.md
index f6220f1d63..1d6c1dab31 100644
--- a/api/CHANGELOG.md
+++ b/api/CHANGELOG.md
@@ -13,6 +13,7 @@ All notable changes to the **Prowler API** are documented in this file.
 
 ### Fixed
 - Scan with no resources will not trigger legacy code for findings metadata [(#8183)](https://github.com/prowler-cloud/prowler/pull/8183)
+- Invitation email comparison case-insensitive [(#8206)](https://github.com/prowler-cloud/prowler/pull/8206)
 
 ### Removed
 - Validation of the provider's secret type during updates [(#8197)](https://github.com/prowler-cloud/prowler/pull/8197)
diff --git a/api/src/backend/api/models.py b/api/src/backend/api/models.py
index 5846212f3d..084cb41c58 100644
--- a/api/src/backend/api/models.py
+++ b/api/src/backend/api/models.py
@@ -943,6 +943,11 @@ class Invitation(RowLevelSecurityProtectedModel):
         null=True,
     )
 
+    def save(self, *args, **kwargs):
+        if self.email:
+            self.email = self.email.strip().lower()
+        super().save(*args, **kwargs)
+
     class Meta(RowLevelSecurityProtectedModel.Meta):
         db_table = "invitations"
 
diff --git a/api/src/backend/api/tests/test_utils.py b/api/src/backend/api/tests/test_utils.py
index 0777267484..1ecbaf6499 100644
--- a/api/src/backend/api/tests/test_utils.py
+++ b/api/src/backend/api/tests/test_utils.py
@@ -254,7 +254,7 @@ class TestValidateInvitation:
 
             assert result == invitation
             mock_db.get.assert_called_once_with(
-                token="VALID_TOKEN", email="user@example.com"
+                token="VALID_TOKEN", email__iexact="user@example.com"
             )
 
     def test_invitation_not_found_raises_validation_error(self):
@@ -269,7 +269,7 @@ class TestValidateInvitation:
                 "invitation_token": "Invalid invitation code."
             }
             mock_db.get.assert_called_once_with(
-                token="INVALID_TOKEN", email="user@example.com"
+                token="INVALID_TOKEN", email__iexact="user@example.com"
             )
 
     def test_invitation_not_found_raises_not_found(self):
@@ -284,7 +284,7 @@ class TestValidateInvitation:
 
             assert exc_info.value.detail == "Invitation is not valid."
             mock_db.get.assert_called_once_with(
-                token="INVALID_TOKEN", email="user@example.com"
+                token="INVALID_TOKEN", email__iexact="user@example.com"
             )
 
     def test_invitation_expired(self, invitation):
@@ -332,5 +332,27 @@ class TestValidateInvitation:
                 "invitation_token": "Invalid invitation code."
             }
             mock_db.get.assert_called_once_with(
-                token="VALID_TOKEN", email="different@example.com"
+                token="VALID_TOKEN", email__iexact="different@example.com"
+            )
+
+    def test_valid_invitation_uppercase_email(self):
+        """Test that validate_invitation works with case-insensitive email lookup."""
+        uppercase_email = "USER@example.com"
+
+        invitation = MagicMock(spec=Invitation)
+        invitation.token = "VALID_TOKEN"
+        invitation.email = uppercase_email
+        invitation.expires_at = datetime.now(timezone.utc) + timedelta(days=1)
+        invitation.state = Invitation.State.PENDING
+        invitation.tenant = MagicMock()
+
+        with patch("api.utils.Invitation.objects.using") as mock_using:
+            mock_db = mock_using.return_value
+            mock_db.get.return_value = invitation
+
+            result = validate_invitation("VALID_TOKEN", "user@example.com")
+
+            assert result == invitation
+            mock_db.get.assert_called_once_with(
+                token="VALID_TOKEN", email__iexact="user@example.com"
             )
diff --git a/api/src/backend/api/utils.py b/api/src/backend/api/utils.py
index ce3f4feb52..378e050b8f 100644
--- a/api/src/backend/api/utils.py
+++ b/api/src/backend/api/utils.py
@@ -187,7 +187,7 @@ def validate_invitation(
         # Admin DB connector is used to bypass RLS protection since the invitation belongs to a tenant the user
         # is not a member of yet
         invitation = Invitation.objects.using(MainRouter.admin_db).get(
-            token=invitation_token, email=email
+            token=invitation_token, email__iexact=email
         )
     except Invitation.DoesNotExist:
         if raise_not_found: