diff --git a/homeassistant/components/overkiz/config_flow.py b/homeassistant/components/overkiz/config_flow.py
index 7a0226837694..43c7b3f3044c 100644
--- a/homeassistant/components/overkiz/config_flow.py
+++ b/homeassistant/components/overkiz/config_flow.py
@@ -171,9 +171,27 @@ class OverkizConfigFlow(ConfigFlow, domain=DOMAIN):
             except TooManyAttemptsBannedException:
                 errors["base"] = "too_many_attempts"
             except UnknownUserException:
+                # If the user has no supported CozyTouch devices on
+                # the Overkiz API server. Login will return unknown user.
+                if user_input[CONF_HUB] in {
+                    Server.ATLANTIC_COZYTOUCH,
+                    Server.SAUTER_COZYTOUCH,
+                    Server.THERMOR_COZYTOUCH,
+                }:
+                    description_placeholders["unsupported_device"] = "CozyTouch"
                 # Somfy Protect accounts are not supported since they don't use
                 # the Overkiz API server. Login will return unknown user.
-                description_placeholders["unsupported_device"] = "Somfy Protect"
+                elif user_input[CONF_HUB] in {
+                    Server.SOMFY_AMERICA,
+                    Server.SOMFY_DEVELOPER_MODE,
+                    Server.SOMFY_EUROPE,
+                    Server.SOMFY_OCEANIA,
+                }:
+                    description_placeholders["unsupported_device"] = "Somfy Protect"
+                # Fallback for other unknown devices
+                else:
+                    description_placeholders["unsupported_device"] = "Unknown"
+
                 errors["base"] = "unsupported_hardware"
             except Exception:  # noqa: BLE001
                 errors["base"] = "unknown"
diff --git a/homeassistant/components/overkiz/strings.json b/homeassistant/components/overkiz/strings.json
index 6f0001691a62..ce783c4eb079 100644
--- a/homeassistant/components/overkiz/strings.json
+++ b/homeassistant/components/overkiz/strings.json
@@ -55,7 +55,7 @@
       "too_many_attempts": "Too many attempts with an invalid token, temporarily banned",
       "too_many_requests": "Too many requests, try again later",
       "unknown": "[%key:common::config_flow::error::unknown%]",
-      "unsupported_hardware": "Your {unsupported_device} hardware is not supported by this integration."
+      "unsupported_hardware": "Your {unsupported_device} hardware is not using the Overkiz platform and can't be supported by this integration."
     },
     "abort": {
       "already_configured": "[%key:common::config_flow::abort::already_configured_account%]",
diff --git a/tests/components/overkiz/test_config_flow.py b/tests/components/overkiz/test_config_flow.py
index 410c2ebb5f1d..f2d9b6c76391 100644
--- a/tests/components/overkiz/test_config_flow.py
+++ b/tests/components/overkiz/test_config_flow.py
@@ -255,6 +255,96 @@ async def test_form_invalid_auth_cloud(
     assert result["errors"] == {"base": error}
 
 
+@pytest.mark.parametrize(
+    ("side_effect", "description_placeholder", "server"),
+    [
+        (UnknownUserException, "CozyTouch", TEST_SERVER_COZYTOUCH),
+        (UnknownUserException, "Unknown", TEST_SERVER2),
+    ],
+)
+async def test_form_invalid_hardware_cloud(
+    hass: HomeAssistant,
+    side_effect: Exception,
+    description_placeholder: str,
+    server: str,
+) -> None:
+    """Test we handle unsupported hardware (cloud)."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    assert result["type"] is FlowResultType.FORM
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {"hub": server},
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "cloud"
+
+    with patch("pyoverkiz.client.OverkizClient.login", side_effect=side_effect):
+        result = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {"username": TEST_EMAIL, "password": TEST_PASSWORD},
+        )
+
+    await hass.async_block_till_done()
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["errors"] == {"base": "unsupported_hardware"}
+    assert result["description_placeholders"] == {
+        "unsupported_device": description_placeholder
+    }
+
+
+@pytest.mark.parametrize(
+    ("side_effect", "description_placeholder", "server"),
+    [
+        (UnknownUserException, "Somfy Protect", TEST_SERVER),
+    ],
+)
+async def test_form_invalid_hardware_cloud_local(
+    hass: HomeAssistant,
+    side_effect: Exception,
+    description_placeholder: str,
+    server: str,
+) -> None:
+    """Test we handle unsupported hardware (cloud and local)."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    assert result["type"] is FlowResultType.FORM
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {"hub": server},
+    )
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        {"api_type": "cloud"},
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "cloud"
+
+    with patch("pyoverkiz.client.OverkizClient.login", side_effect=side_effect):
+        result = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {"username": TEST_EMAIL, "password": TEST_PASSWORD},
+        )
+
+    await hass.async_block_till_done()
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["errors"] == {"base": "unsupported_hardware"}
+    assert result["description_placeholders"] == {
+        "unsupported_device": description_placeholder
+    }
+
+
 @pytest.mark.parametrize(
     ("side_effect", "error"),
     [