diff --git a/newsfragments/1502.change.rst b/newsfragments/1502.change.rst
new file mode 100644
index 00000000..72d47f15
--- /dev/null
+++ b/newsfragments/1502.change.rst
@@ -0,0 +1,3 @@
+Send cookies which the browser holds for the Vuforia developer portal
+itself, and so have no domain attribute of their own, with requests to
+the Vuforia credentials API.
diff --git a/src/vws_web_tools/__init__.py b/src/vws_web_tools/__init__.py
index 5945b8ae..79f150e4 100644
--- a/src/vws_web_tools/__init__.py
+++ b/src/vws_web_tools/__init__.py
@@ -1348,6 +1348,11 @@ def _requests_session_from_driver(
     if not _is_json_array(cookies):
         return session
 
+    # A cookie set for the current host has no ``domain`` attribute of
+    # its own. Give those the browser's host, as a cookie with no domain
+    # is never sent.
+    current_host = urlparse(url=driver.current_url).hostname
+
     for cookie in cookies:
         if not _is_json_object(cookie):
             continue
@@ -1356,12 +1361,13 @@ def _requests_session_from_driver(
         if not isinstance(name, str) or not isinstance(value, str):
             continue
 
-        domain = cookie.get("domain")
+        raw_domain = cookie.get("domain")
+        domain = raw_domain if isinstance(raw_domain, str) else current_host
         path = cookie.get("path")
         cookie_kwargs = {
             "path": path if isinstance(path, str) else "/",
         }
-        if isinstance(domain, str):
+        if domain:
             cookie_kwargs["domain"] = domain
         session.cookies.set(
             name=name,
diff --git a/tests/test_model_target_web_api_details.py b/tests/test_model_target_web_api_details.py
index e135521c..d8a58351 100644
--- a/tests/test_model_target_web_api_details.py
+++ b/tests/test_model_target_web_api_details.py
@@ -12,6 +12,8 @@
 
 import vws_web_tools
 
+_PORTAL_URL = "https://developer.vuforia.com/develop/credentials"
+
 
 class _BrowserStateDriver(WebDriver):
     """A WebDriver shell with controlled browser state."""
@@ -21,10 +23,17 @@ def __init__(
         *,
         user_agent: object,
         cookies: object,
+        current_url: str,
     ) -> None:
         """Store controlled browser state."""
         self._user_agent = user_agent
         self._cookies = cookies
+        self._current_url = current_url
+
+    @property
+    def current_url(self) -> str:
+        """Return the controlled browser URL."""
+        return self._current_url
 
     def execute_script(self, script: str, *args: object) -> object:
         """Return the controlled user agent."""
@@ -52,16 +61,33 @@ def test_requests_session_from_driver_copies_browser_state() -> None:
             {"name": "bad-value", "value": 123},
             "not a cookie",
         ],
+        current_url=_PORTAL_URL,
     )
 
     session = vws_web_tools._requests_session_from_driver(driver=driver)
 
     assert session.headers["User-Agent"] == "test browser"
     assert session.cookies.get(name="session", domain="example.com") == "abc"
-    assert session.cookies.get(name="host") == "only"
+    assert (
+        session.cookies.get(name="host", domain="developer.vuforia.com")
+        == "only"
+    )
     assert session.cookies.get(name="bad-value") is None
 
 
+def test_requests_session_from_driver_without_a_browser_host() -> None:
+    """A host-only cookie is still set when the URL names no host."""
+    driver = _BrowserStateDriver(
+        user_agent="test browser",
+        cookies=[{"name": "host", "value": "only"}],
+        current_url="about:blank",
+    )
+
+    session = vws_web_tools._requests_session_from_driver(driver=driver)
+
+    assert session.cookies.get(name="host") == "only"
+
+
 @pytest.mark.parametrize(
     argnames=("user_agent", "cookies"),
     argvalues=[
@@ -78,6 +104,7 @@ def test_requests_session_from_driver_handles_unexpected_browser_state(
     driver = _BrowserStateDriver(
         user_agent=user_agent,
         cookies=cookies,
+        current_url=_PORTAL_URL,
     )
 
     session = vws_web_tools._requests_session_from_driver(driver=driver)