diff --git a/frontend/src/scenes/experiments/ExperimentForm.tsx b/frontend/src/scenes/experiments/ExperimentForm.tsx
index c0d58cfc5626b..ebf717865a68e 100644
--- a/frontend/src/scenes/experiments/ExperimentForm.tsx
+++ b/frontend/src/scenes/experiments/ExperimentForm.tsx
@@ -18,9 +18,8 @@ const ExperimentFormFields = (): JSX.Element => {
     const { experiment, groupTypes, aggregationLabel } = useValues(experimentLogic)
     const { addVariant, removeExperimentGroup, setExperiment, createExperiment, setExperimentType } =
         useActions(experimentLogic)
-    const { webExperimentsAvailable } = useValues(experimentsLogic)
+    const { webExperimentsAvailable, unavailableFeatureFlagKeys } = useValues(experimentsLogic)
     const { groupsAccessStatus } = useValues(groupsAccessLogic)
-    const { takenKeys } = useValues(experimentsLogic)
 
     return (
         <div>
@@ -40,14 +39,14 @@ const ExperimentFormFields = (): JSX.Element => {
                                 <LemonButton
                                     type="secondary"
                                     size="xsmall"
-                                    tooltip={
-                                        experiment.name
-                                            ? 'Generate a key from the experiment name'
-                                            : 'Fill out the experiment name first.'
-                                    }
+                                    disabledReason={experiment.name ? undefined : 'Fill out the experiment name first.'}
+                                    tooltip={experiment.name ? 'Generate a key from the experiment name' : undefined}
                                     onClick={() => {
                                         setExperiment({
-                                            feature_flag_key: generateFeatureFlagKey(experiment.name, takenKeys),
+                                            feature_flag_key: generateFeatureFlagKey(
+                                                experiment.name,
+                                                unavailableFeatureFlagKeys
+                                            ),
                                         })
                                     }}
                                 >
@@ -294,7 +293,7 @@ export function ExperimentForm(): JSX.Element {
     )
 }
 
-const generateFeatureFlagKey = (name: string, takenKeys: string[]): string => {
+const generateFeatureFlagKey = (name: string, unavailableFeatureFlagKeys: Set<string>): string => {
     const baseKey = name
         .toLowerCase()
         .replace(/[^A-Za-z0-9-_]+/g, '-')
@@ -303,7 +302,8 @@ const generateFeatureFlagKey = (name: string, takenKeys: string[]): string => {
 
     let key = baseKey
     let counter = 1
-    while (takenKeys.includes(key)) {
+
+    while (unavailableFeatureFlagKeys.has(key)) {
         key = `${baseKey}-${counter}`
         counter++
     }
diff --git a/frontend/src/scenes/experiments/experimentsLogic.ts b/frontend/src/scenes/experiments/experimentsLogic.ts
index 361414fb2bf64..ff79c0936bf32 100644
--- a/frontend/src/scenes/experiments/experimentsLogic.ts
+++ b/frontend/src/scenes/experiments/experimentsLogic.ts
@@ -7,6 +7,7 @@ import api from 'lib/api'
 import { FEATURE_FLAGS } from 'lib/constants'
 import { lemonToast } from 'lib/lemon-ui/LemonToast/LemonToast'
 import { featureFlagLogic, FeatureFlagsSet } from 'lib/logic/featureFlagLogic'
+import { featureFlagsLogic, type FeatureFlagsResult } from 'scenes/feature-flags/featureFlagsLogic'
 import { projectLogic } from 'scenes/projectLogic'
 import { userLogic } from 'scenes/userLogic'
 
@@ -44,6 +45,8 @@ export const experimentsLogic = kea<experimentsLogicType>([
             ['user', 'hasAvailableFeature'],
             featureFlagLogic,
             ['featureFlags'],
+            featureFlagsLogic,
+            ['featureFlags'],
             router,
             ['location'],
         ],
@@ -161,10 +164,15 @@ export const experimentsLogic = kea<experimentsLogicType>([
             () => [featureFlagLogic.selectors.featureFlags],
             (featureFlags: FeatureFlagsSet) => featureFlags[FEATURE_FLAGS.WEB_EXPERIMENTS],
         ],
-        // This only checks the first page, which is very large so it's not a big deal
-        takenKeys: [
-            (s) => [s.experiments],
-            (experiments: Experiment[]) => experiments.map((experiment) => experiment.feature_flag_key),
+        // TRICKY: we do not load all feature flags here, just the latest ones.
+        unavailableFeatureFlagKeys: [
+            (s) => [featureFlagsLogic.selectors.featureFlags, s.experiments],
+            (featureFlags: FeatureFlagsResult, experiments: Experiment[]) => {
+                return new Set([
+                    ...featureFlags.results.map((flag) => flag.key),
+                    ...experiments.map((experiment) => experiment.feature_flag_key),
+                ])
+            },
         ],
     })),
     events(({ actions }) => ({