diff --git a/CHANGELOG.md b/CHANGELOG.md
index a03ba795..81518a88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@
 
 ### Fixed
 
+- **OIDC allowlist values containing spaces (e.g. a group named `Hermes Users`) are no longer split into separate entries.** The allowlist parser split comma-separated values on all whitespace, so a multi-word group/user name became two spurious entries. Allowlist parsing now splits only on commas/newlines (multi-word values stay intact and match their exact signed claim — strictly tightening, no security loosening), while OAuth **scope** parsing keeps its space-delimited behavior per RFC 6749 §3.3. A blank allowlist entry no longer bricks an OIDC-only deployment. Thanks @webtecnica. (#6244)
+
 - **`/sessions` and `/resume` typed in the composer now open the session browser instead of being sent as chat text.** Both commands appeared in the slash-command autocomplete (they're exposed by `/api/commands`) but the WebUI send-time dispatch didn't handle them, so they were posted to the agent as plain text. They now open the native WebUI session browser and clear the composer — on desktop and (via the mobile-aware opener) on phone-width layouts. Thanks @webtecnica. (#6245, #6224)
 
 - **Z.AI GLM models now advertise the correct reasoning controls per version.** The WebUI offered the full `reasoning_effort` ladder (max/xhigh/high/medium/low/minimal) for every GLM model, but per Z.AI's API only GLM-5.2+ supports the effort ladder — GLM-4.5 through 5.1 support the binary `thinking` on/off toggle, and GLM-4.7 forces thinking on (not configurable). Reasoning controls are now gated correctly: GLM-5.2+ keeps the full ladder + None, GLM-4.5/4.6/5.0/5.1 get a two-way On/None thinking toggle (no effort levels), and GLM-4.7 shows forced thinking with no toggle. All three surfaces (config status, effort resolution, composer chip) agree across model tiers, provider aliases, and namespaces. Thanks @rh-id. (#6219)
diff --git a/api/auth_oidc.py b/api/auth_oidc.py
index 9bd9b0f2..384bae2b 100644
--- a/api/auth_oidc.py
+++ b/api/auth_oidc.py
@@ -207,7 +207,22 @@ def _normalize_scopes(raw: Any) -> list[str]:
 
 
 def _normalize_allow_values(raw: Any) -> list[str]:
-    return _normalize_text_list(raw)
+    """Normalize allowlist values, splitting only on commas/newlines.
+
+    Unlike ``_normalize_text_list`` (which also splits on whitespace), this
+    preserves multi-word values such as OIDC group names containing spaces
+    (e.g. ``"Hermes Users"`` stays as one entry).
+
+    RFC 6749 §3.3 requires space-delimited scope strings, so
+    ``_normalize_scopes`` must keep using ``_normalize_text_list`` -- this
+    function is for allow-values only.
+    """
+    if raw is None:
+        return []
+    if isinstance(raw, (list, tuple, set)):
+        return [value for value in (str(item).strip() for item in raw) if value]
+    text = str(raw).replace("\n", ",")
+    return [part.strip() for part in text.split(",") if part.strip()]
 
 
 def _normalize_text_list(raw: Any) -> list[str]:
diff --git a/tests/test_issue3825_oidc_auth.py b/tests/test_issue3825_oidc_auth.py
index 199a5aa5..4307e732 100644
--- a/tests/test_issue3825_oidc_auth.py
+++ b/tests/test_issue3825_oidc_auth.py
@@ -547,3 +547,23 @@ def test_coerce_numeric_claim_rejects_non_finite_values(value):
 
     with pytest.raises(OIDCAuthError, match="claim exp was not numeric"):
         auth_oidc._coerce_numeric_claim({"exp": value}, "exp")
+
+
+def test_normalize_allow_values_and_scopes_use_separate_delimiters():
+    """#6244: allowlist values are comma/newline-delimited (multi-word group names
+    like "Hermes Users" stay intact), while OAuth scopes stay space-delimited
+    (RFC 6749 §3.3). The two parsers must NOT share whitespace-splitting."""
+    from api import auth_oidc
+
+    # Allowlist: multi-word group name stays ONE entry; commas/newlines split.
+    assert auth_oidc._normalize_allow_values("Hermes Users") == ["Hermes Users"]
+    assert auth_oidc._normalize_allow_values("Hermes Users, Admins") == ["Hermes Users", "Admins"]
+    assert auth_oidc._normalize_allow_values("a\nb") == ["a", "b"]
+    # Blank collection elements are filtered (a bare [""] must not brick OIDC login).
+    assert auth_oidc._normalize_allow_values([""]) == []
+    assert auth_oidc._normalize_allow_values(["Hermes Users", "", "  "]) == ["Hermes Users"]
+
+    # Scopes: space-delimited per RFC 6749 §3.3 — whitespace splitting is retained.
+    assert auth_oidc._normalize_text_list("openid profile email") == ["openid", "profile", "email"]
+    scopes = auth_oidc._normalize_scopes("openid profile email")
+    assert scopes[:3] == ["openid", "profile", "email"]