The ADMX template lists the UserMessaging under a subcategory UserMessaging.
In testing the OMI-URIs for UserMessaging failed when being applied by Intune.
Here are the corrected OMI-URIs.
#### Windows (Intune)
OMA-URI:
```
#### Windows (Intune)
OMA-URI:
```
-./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/UserMessaging_WhatsNew
-./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/UserMessaging_ExtensionRecommendations
-./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/UserMessaging_FeatureRecommendations
-./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/UserMessaging_UrlbarInterventions
-./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/UserMessaging_SkipOnboarding
+./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox~UserMessaging/UserMessaging_WhatsNew
+./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox~UserMessaging/UserMessaging_ExtensionRecommendations
+./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox~UserMessaging/UserMessaging_FeatureRecommendations
+./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox~UserMessaging/UserMessaging_UrlbarInterventions
+./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox~UserMessaging/UserMessaging_SkipOnboarding