Restrict site access to visitors doesn’t work on staging site

Hi there,
Thanks for the great plugin. For some reason one of the options is not working on the staging sites for our websites. It doesn’t save the following checkbox on the settings on Staging site.
-Restrict site access to visitors who are logged in or allowed by IP address

So I had to look for an alternative plugin for our website, I found “Content Control” plugin which works on the staging site as well, I mention it here so in case someone has the same issue can save some time.
Thanks,
Sara