Phonebook 404 on url

For some reason i get a 404 error on the phonebook url.

phonebook 1
phonebook 2

I already tried uninstalling and reinstalling the add-on.
Also tried to create an extra phonebook, but that one didn’t work too.

The Phonebook for security reasons can only be accessed from approved phones such as Yealink, Grandstream, etc.
It is not possible to access from any borowser.

That seems like a good idea to prevent access from other devices to prevent data leakage.
However it would be better to serve a 403 http code. Access denied.
That way i know it is working, but it isn’t allowed to view this page from the device i am using.

Would be really nice to be able to watch the file anyway when logged in at vitalpbx gui to check it.