diff --git a/CHANGES.md b/CHANGES.md
index 2d0516328e..15477e736a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -50,6 +50,7 @@
 
 ### :bug: Bugs fixed
 
+- Fix `PENPOT_OIDC_USER_INFO_SOURCE` flag being silently ignored (`userinfo` / `token`) in the OIDC callback, causing "incomplete user info" failures during registration [Github #9108](https://github.com/penpot/penpot/issues/9108)
 - Fix `get-view-only-bundle` crashing when a share-link viewer encounters a team member whose email lacks `@` (NullPointerException in `obfuscate-email`) or whose domain has no `.` (previously produced a dangling-dot `****@****.`); now the viewer-side obfuscation is nil-safe and omits the trailing dot when the domain has no TLD
 - Remove `corepack` from the MCP local launcher so it runs on Node.js 25+, where corepack is no longer bundled [Github #8877](https://github.com/penpot/penpot/issues/8877)
 - Fix Copy as SVG: emit a single valid SVG document when multiple shapes are selected, and publish `image/svg+xml` to the clipboard so the paste target works in Inkscape and other SVG-native tools [Github #838](https://github.com/penpot/penpot/issues/838)
diff --git a/backend/src/app/auth/oidc.clj b/backend/src/app/auth/oidc.clj
index 9c292ff2c2..782dfabca7 100644
--- a/backend/src/app/auth/oidc.clj
+++ b/backend/src/app/auth/oidc.clj
@@ -548,16 +548,29 @@
 (def ^:private valid-info?
   (sm/validator schema:info))
 
+(defn- select-user-info-source
+  "Normalise the provider's configured user-info source into a keyword the
+  dispatch below can match. The raw value comes from config as a string
+  per the malli schema in `app.config` (`\"token\"`, `\"userinfo\"`, or
+  `\"auto\"`) and from hard-coded per-provider maps as strings as well;
+  any unrecognised or missing value falls back to `:auto` (prefer claims,
+  use userinfo as fallback)."
+  [source]
+  (case source
+    "token"    :token
+    "userinfo" :userinfo
+    :auto))
+
 (defn- get-info
   [cfg provider state code]
   (let [tdata  (fetch-access-token cfg provider code)
         claims (get-id-token-claims provider tdata)
 
-        info   (case (get provider :user-info-source)
-                 :token (dissoc claims :exp :iss :iat :aud :sid)
+        info   (case (select-user-info-source (get provider :user-info-source))
+                 :token    (dissoc claims :exp :iss :iat :aud :sid)
                  :userinfo (fetch-user-info cfg provider tdata)
-                 (or (some-> claims (dissoc :exp :iss :iat :aud :sid))
-                     (fetch-user-info cfg provider tdata)))
+                 :auto     (or (some-> claims (dissoc :exp :iss :iat :aud :sid))
+                               (fetch-user-info cfg provider tdata)))
 
         info   (process-user-info provider tdata info)]
 
diff --git a/backend/test/backend_tests/auth_oidc_test.clj b/backend/test/backend_tests/auth_oidc_test.clj
index 2a451195c5..bdf18e5541 100644
--- a/backend/test/backend_tests/auth_oidc_test.clj
+++ b/backend/test/backend_tests/auth_oidc_test.clj
@@ -33,3 +33,23 @@
     (t/is (= "nextcloud@example.com" (:email info)))
     (t/is (= "Nextcloud User" (:fullname info)))
     (t/is (true? (:email-verified info)))))
+
+;; The provider's `:user-info-source` value arrives as a string (enforced by
+;; the malli schema in `app.config` and used as-is by the hard-coded Google /
+;; GitHub provider maps), so the dispatch must interpret strings — not
+;; keywords — to actually honour `PENPOT_OIDC_USER_INFO_SOURCE=userinfo`.
+(t/deftest select-user-info-source-interprets-config-strings
+  (t/testing "explicit string values map to keyword dispatch tokens"
+    (t/is (= :token    (#'oidc/select-user-info-source "token")))
+    (t/is (= :userinfo (#'oidc/select-user-info-source "userinfo"))))
+
+  (t/testing "missing or explicit \"auto\" falls back to auto dispatch"
+    (t/is (= :auto (#'oidc/select-user-info-source "auto")))
+    (t/is (= :auto (#'oidc/select-user-info-source nil))))
+
+  (t/testing "unknown values fall back to auto dispatch safely"
+    (t/is (= :auto (#'oidc/select-user-info-source "unknown")))
+    ;; Guards against the reverse regression — a stray keyword value must
+    ;; not silently slip through as if it were the matching string.
+    (t/is (= :auto (#'oidc/select-user-info-source :token)))
+    (t/is (= :auto (#'oidc/select-user-info-source :userinfo)))))