diff --git a/homeassistant/components/onvif/__init__.py b/homeassistant/components/onvif/__init__.py
index 2c96b79cbeb..a7c23064f64 100644
--- a/homeassistant/components/onvif/__init__.py
+++ b/homeassistant/components/onvif/__init__.py
@@ -1,5 +1,6 @@
 """The ONVIF integration."""
 import asyncio
+from http import HTTPStatus
 import logging
 
 from httpx import RequestError
@@ -56,7 +57,20 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     except ONVIFError as err:
         await device.device.close()
         raise ConfigEntryNotReady(
-            f"Could not setup camera {device.device.host}:{device.device.port}: {err}"
+            f"Could not setup camera {device.device.host}:{device.device.port}: {stringify_onvif_error(err)}"
+        ) from err
+    except TransportError as err:
+        await device.device.close()
+        stringified_onvif_error = stringify_onvif_error(err)
+        if err.status_code in (
+            HTTPStatus.UNAUTHORIZED.value,
+            HTTPStatus.FORBIDDEN.value,
+        ):
+            raise ConfigEntryAuthFailed(
+                f"Auth Failed: {stringified_onvif_error}"
+            ) from err
+        raise ConfigEntryNotReady(
+            f"Could not setup camera {device.device.host}:{device.device.port}: {stringified_onvif_error}"
         ) from err
     except asyncio.CancelledError as err:
         # After https://github.com/agronholm/anyio/issues/374 is resolved
diff --git a/homeassistant/components/onvif/config_flow.py b/homeassistant/components/onvif/config_flow.py
index 27f279266dd..ca447c71b84 100644
--- a/homeassistant/components/onvif/config_flow.py
+++ b/homeassistant/components/onvif/config_flow.py
@@ -142,10 +142,14 @@ class OnvifFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
                 hass.async_create_task(hass.config_entries.async_reload(entry_id))
                 return self.async_abort(reason="reauth_successful")
 
+        username = (user_input or {}).get(CONF_USERNAME) or entry.data[CONF_USERNAME]
         return self.async_show_form(
             step_id="reauth_confirm",
             data_schema=vol.Schema(
-                {vol.Required(CONF_USERNAME): str, vol.Required(CONF_PASSWORD): str}
+                {
+                    vol.Required(CONF_USERNAME, default=username): str,
+                    vol.Required(CONF_PASSWORD): str,
+                }
             ),
             errors=errors,
             description_placeholders=description_placeholders,
diff --git a/homeassistant/components/onvif/strings.json b/homeassistant/components/onvif/strings.json
index 55413e4bf6c..3e9db0b3c7e 100644
--- a/homeassistant/components/onvif/strings.json
+++ b/homeassistant/components/onvif/strings.json
@@ -47,6 +47,7 @@
       },
       "reauth_confirm": {
         "title": "Reauthenticate the ONVIF device",
+        "description": "Some devices will reject authentication if the time is out of sync by more than 5 seconds. If authentication is unsuccessful, verify the time on the device is correct and try again.",
         "data": {
           "username": "[%key:common::config_flow::data::username%]",
           "password": "[%key:common::config_flow::data::password%]"
diff --git a/tests/components/onvif/test_config_flow.py b/tests/components/onvif/test_config_flow.py
index 21ef1cf3fc2..8187a427be9 100644
--- a/tests/components/onvif/test_config_flow.py
+++ b/tests/components/onvif/test_config_flow.py
@@ -5,7 +5,7 @@ from homeassistant import config_entries, data_entry_flow
 from homeassistant.components import dhcp
 from homeassistant.components.onvif import DOMAIN, config_flow
 from homeassistant.config_entries import SOURCE_DHCP
-from homeassistant.const import CONF_HOST
+from homeassistant.const import CONF_HOST, CONF_USERNAME
 from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
 from homeassistant.helpers import device_registry as dr
@@ -710,6 +710,14 @@ async def test_discovered_by_dhcp_does_not_update_if_no_matching_entry(
     assert result["reason"] == "no_devices_found"
 
 
+def _get_schema_default(schema, key_name):
+    """Iterate schema to find a key."""
+    for schema_key in schema:
+        if schema_key == key_name:
+            return schema_key.default()
+    raise KeyError(f"{key_name} not found in schema")
+
+
 async def test_form_reauth(hass: HomeAssistant) -> None:
     """Test reauthenticate."""
     entry, _, _ = await setup_onvif_integration(hass)
@@ -721,6 +729,10 @@ async def test_form_reauth(hass: HomeAssistant) -> None:
     )
     assert result["type"] == FlowResultType.FORM
     assert result["step_id"] == "reauth_confirm"
+    assert (
+        _get_schema_default(result["data_schema"].schema, CONF_USERNAME)
+        == entry.data[CONF_USERNAME]
+    )
 
     with patch(
         "homeassistant.components.onvif.config_flow.get_device"