Membership 2 Pro blocking Google Search Index


I am having some difficulties with the Membership 2 Pro plugin.

It seems to not letting Google's crawlers pass the restrictions, even though I have activated and added the "Search Index" add-on on all of the restricted pages on my site.

When Google crawls my site and the restricted pages, it returns with a 404 Not Found error.

What can be the problem?

Thanks in advance!