Issues configuring browser extensions using Intune and ADMX templates

Hi All, I am trying to block the Last Pass extension in Firefox using Intune, and the ADMX configuration setting is not working on the endpoint. I've used the templates found here https://github.com/mozilla/policy-templates/releases / Target Extension "support@lastpass.com" And have tried using the imported admx template as well as a single line OMA-URI. I've worked with Microsoft, and they see the correct settings on the device as pushed out via Intune, so they said it is not on their end. Any ideas why blocking named browser extenstions is not working? I've configured a few other settings with Intune/ADMX templates and they work. Thanks! -Doug