diff --git a/linkml_runtime/utils/schema_builder.py b/linkml_runtime/utils/schema_builder.py
index b7d6024b..9544a09f 100644
--- a/linkml_runtime/utils/schema_builder.py
+++ b/linkml_runtime/utils/schema_builder.py
@@ -179,6 +179,12 @@ def add_enum(
         if permissible_values is None:
             permissible_values = []
 
+        # Validate kwargs - all keys must be valid EnumDefinition fields
+        valid_fields = {f.name for f in fields(EnumDefinition)}
+        invalid_kwargs = set(kwargs.keys()) - valid_fields
+        if invalid_kwargs:
+            raise ValueError(f"Invalid kwargs for EnumDefinition: {', '.join(invalid_kwargs)}")
+        
         if isinstance(enum_def, str):
             enum_def = EnumDefinition(enum_def, **kwargs)
         elif isinstance(enum_def, dict):
@@ -191,6 +197,8 @@ def add_enum(
                     f"not {type(enum_def)!r}"
                 )
                 raise TypeError(msg)
+            
+            # No need to apply kwargs to existing EnumDefinition object
 
         if enum_def.name in self.schema.enums and not replace_if_present:
             raise ValueError(f"Enum {enum_def.name} already exists")
diff --git a/linkml_runtime/utils/schemaview.py b/linkml_runtime/utils/schemaview.py
index bc76bcaa..8d011084 100644
--- a/linkml_runtime/utils/schemaview.py
+++ b/linkml_runtime/utils/schemaview.py
@@ -15,7 +15,7 @@
 from linkml_runtime.utils.namespaces import Namespaces
 from deprecated.classic import deprecated
 from linkml_runtime.utils.context_utils import parse_import_map, map_import
-from linkml_runtime.utils.formatutils import is_empty, underscore, camelcase
+from linkml_runtime.utils.formatutils import camelcase, is_empty, sfx, underscore
 from linkml_runtime.utils.pattern import PatternResolver
 from linkml_runtime.linkml_model.meta import *
 from linkml_runtime.exceptions import OrderingError
@@ -1121,13 +1121,18 @@ def get_uri(self, element: Union[ElementName, Element], imports=True, expand=Fal
                     raise ValueError(f'Cannot find {e.from_schema} in schema_map')
             else:
                 schema = self.schema_map[self.in_schema(e.name)]
-            pfx = schema.default_prefix
             if use_element_type:
                 e_type = e.class_name.split("_",1)[0]  # for example "class_definition"
                 e_type_path = f"{e_type}/" 
             else:
                 e_type_path = ""
-            uri = f'{pfx}:{e_type_path}{e_name}'
+            pfx = schema.default_prefix
+            # To construct the uri we have to find out if the schema has a default_prefix 
+            # or if a pseudo "prefix" was derived from the schema id.
+            if pfx == sfx(str(schema.id)):  # no prefix defined in schema
+                uri = f'{pfx}{e_type_path}{e_name}'
+            else:
+                uri = f'{pfx}:{e_type_path}{e_name}'
         if expand:
             return self.expand_curie(uri)
         else:
diff --git a/tests/test_utils/test_schema_builder.py b/tests/test_utils/test_schema_builder.py
index 707d75ef..643f9b7f 100644
--- a/tests/test_utils/test_schema_builder.py
+++ b/tests/test_utils/test_schema_builder.py
@@ -185,7 +185,7 @@ def test_add_class_with_extra_kwargs(
 )
 def test_add_enum_with_extra_permissible_values(
     enum_def: EnumDefinition,
-    permissible_values: List[Union[str, PermissibleValue]],
+    permissible_values: list[Union[str, PermissibleValue]],
     expected_added_enum: Optional[EnumDefinition],
 ):
     """
@@ -231,7 +231,7 @@ def test_add_enum_with_extra_permissible_values(
 )
 def test_add_enum_with_extra_kwargs(
     enum_def: Union[EnumDefinition, dict, str],
-    extra_kwargs: Dict[str, Any],
+    extra_kwargs: dict[str, Any],
     expected_added_enum: Optional[EnumDefinition],
 ):
     """
diff --git a/tests/test_utils/test_schemaview.py b/tests/test_utils/test_schemaview.py
index 2cca0cfa..2b1ce32a 100644
--- a/tests/test_utils/test_schemaview.py
+++ b/tests/test_utils/test_schemaview.py
@@ -488,7 +488,6 @@ def test_imports(view):
     height = view.get_slot('height_in_m')
     assert height.unit.ucum_code == "m"
 
-
 def test_imports_from_schemaview(view):
     """view should by default dynamically include imports chain"""
     view2 = SchemaView(view.schema)
@@ -923,3 +922,17 @@ def test_type_and_slot_with_same_name():
     view.add_type(TypeDefinition(name="test", from_schema="https://example.org/imported#"))
 
     assert view.get_uri("test", imports=True) == "ex:test"
+
+
+def test_uris_without_default_prefix():
+    """
+    Test if uri is correct if no default_prefix is defined for the schema. Issue: linkml/linkml#2578
+    """
+    schema_definition = SchemaDefinition(id="https://example.org/test#", name="test_schema")
+
+    view = SchemaView(schema_definition)
+    view.add_class(ClassDefinition(name="TestClass", from_schema="https://example.org/another#"))
+    view.add_slot(SlotDefinition(name="test_slot", from_schema="https://example.org/another#"))
+
+    assert view.get_uri("TestClass", imports=True) == "https://example.org/test#TestClass"
+    assert view.get_uri("test_slot", imports=True) == "https://example.org/test#test_slot"