I was unable to select plugin support because I have uninstalled the plugin
I tested the WPMU Membership plugin but deleted it as it was not right for my needs at that time.
However, the deletion has not removed all instances from the database as I have encountered a handful of 404's that Google Removal Tool has denied removal because there are references in the database to pages/posts left behind by Membership
I am unsure what I can safely remove, and also just how many of them there are.
I should not be left with references to a plugin that is deleted from my website
Here is an example
Google has denied removal but that page has no place on my website.